Okay, looks like we'll have to go to very basics. First about the Beacon.
Have you ever seen a (usually) grey thingy in-world with a display that reads
Opensimworld
teleporter
Click for destinations
Something that looks like any of these?
https://hub.netzgemeinde.eu/photo/41467a68-40f3-448b-bd1c-...
To people who are new to OpenSim, it looks like some nifty teleporter and nothing else.
This, however, is a so-called OpenSimWorld Beacon.
The OpenSimWorld Beacon is the connection between your sim in-world and this very website, OpenSimWorld. Sim entries on OpenSimWorld only work if the sim in question has an OpenSimWorld Beacon standing on it, and the Beacon is correctly configured and set up.
What the OpenSimWorld Beacon does is a) identify the sim, b) read and transmit the name of the sim to OpenSimWorld, c) confirm that the sim is online and d) send the number of avatars on the sim to OpenSimWorld whenever an avatars enters or leaves the sim. The functionality of a teleporter that uses the same data as the website OpenSimWorld is just a side bonus. This thing is an "antenna" first and foremost.
If you want your sim to correctly show up on OpenSimWorld, you need an OpenSimWorld Beacon. You can get it in an in-world place that's called OpenSimWorld, too. It's the personal sim of Satyr Aeon, the admin of OpenSimWorld who also develops the Beacon, so it's the official sim to offer the Beacon.
To the right of the sim's own working Beacon (it looks like the one in the middle in my picture), you'll find a white box labelled
Opensimworld
tools
This is the box you need. Inside the box, you'll find two up-to-date Beacons, the standard one (the one in the middle in my picture) and the steampunk one (the one on the very right in my picture), and a notecard with instructions. Read these instructions carefully and do everything they say all the way through. Do not skip a single step.
Only get your Beacon from this sim. If you see similar boxes elsewhere in-world, don't take them. They may be outdated. Only the box on the OpenSimWorld sim is guaranteed to always be up-to-date.
And never, ever, EVER try to simply copy a Beacon from another sim. EVER. Don't even THINK about it. Even if it seems a thousand times more convenient to just take a Beacon than to get a box and unpack it and read some stupid instructions. NEVER COPY SOMEONE ELSE'S BEACON. That'd break the OpenSimWorld entry of whatever sim you've taken the Beacon from.
Okay, so you've picked up the box. I hope you know how to unpack a box and get the items that are inside the box into your inventory.
Step two then: Place the Beacon that you'd like to use on your sim where you'd like it to be. But beware: If you haven't set up a forced landing-point for avatars teleporting into your sim, they will land in front of the Beacon. So place it in such a way that avatars can a) land in front of it and b) get away from that place without having to fly or teleport by map.
The Beacon will probably say that it's offline.
Step three: Click on the area that says
Opensimworld
teleporter
Click for destinations
If you've used a Beacon as a teleporter before, you should know, but anyway: This area is a display, a touch screen.
The Beacon will then ask you for a Beacon Key.
Step four: So you've read on OpenSimWorld, "Copy this key, click on your Beacon and paste it to activate." This is what you have to do next. Go to OpenSimWorld, go to your unfinished sim entry, find the Beacon Key and copy it.
Step five: Your in-world OpenSimWorld Beacon is still waiting for the Beacon Key. Paste the Beacon Key you've just copied from the website to where the Beacon asks you to enter it.
It is not before then that OpenSimWorld will list your sim as online and automatically post stats about it. Because it is not before then that OpenSimWorld even knows for sure that your sim exists.
Step six: Okay, your sim is connected to OpenSimWorld. But you aren't done yet. This step is CRITICAL:
Right-click your Beacon. Edit it. Go to the General tab. Find the place that says
Anyone
☐ Move ☑ Copy
Un-check Copy so it reads
Anyone
☐ Move ☐ Copy
This makes sure that nobody can copy your running Beacon.
Why this is important? Because there are people who know these grey thingies with the touchscreen, but they don't know OpenSimWorld, they don't know that this is an in-world "antenna" (you didn't know either until I told you in this post), and they take it for a really cool teleporter (so I did the first few weeks when I was new). And they want one. And they try to copy one.
And if they manage to copy yours, they'll put it on their land. But the Beacon won't automatically recognise that it's no longer "at home". Instead, it'll transmit data from THEIR land and about THEIR land to YOUR sim entry on OpenSimWorld. On OpenSimWorld, your sim will suddenly have the name of their sim at least sometimes. And when it does, people will not be able to use OpenSimWorld to get to your place.
So you absolutely have to make sure that people can't simply copy and take your beacon.
As for your entry on OpenSimWorld, you do have to select a grid where it tells you to. This is the only way to tell OpenSimWorld on which grid your sim is. It can't read that from a hop link. OpenSimWorld will automatically generate the hop link itself from a) the grid you've selected and b) the sim name which your beacon will transmit once you've gone through the above procedure and set it up.
As for the picture, you can only upload one picture to show on your sim entry. If you want more pictures, you have to add a post to your sim entry. The pictures which you upload and include in your posts will be shown along with the one picture you've uploaded as your main picture.
As for listing and ranking, sims that have been offline for long enough always get the lowest ranking possible. The difference between "1,487th" and "1,488th" means that someone else has added a new sim and connected it to OpenSimWorld in the meantime.
The link you've posted (
https://opensimworld.com/dir?vm=live&grid=&search=&cat=&st...) only shows live (= online) sims. Your sim, however, is seen by OpenSimWorld as offline for as long as you don't install and configure an OpenSimWorld beacon as described above.
I hope this was halfway understandable.