1. Go to https://lemmyverse.net
2. Click the “communities” tab up top.
3. Click the “Instances” filter button
4. Click “Hide All” then search for the instance you want and enable that one.
5. Click the house icon at the top of the page and enter your home instance

Now you see a list of all communities on that (or multiple) instances, and clicking on them takes you right to that community on your own instance. It’s the best way I’ve found.

I don’t use wefwef.app, but I’m assuming the issue is to do with mander.xyz being an instance (like lemmy.world or sh.itjust.works).

The point being that any communities from mander.xyz will still show up if you search for them on wefwef.app

For example, I searched wefwef for the communities labeled mycology and it brought up the correct community from mander.xyz:

https://wefwef.app/search/lemmy.world/c/mycology@mander.xyz

Edit: in essence it search works for searching for a community, but not an instance as a whole; I couldn’t just search wefwef.app for mander.xyz and see all of its communities listed, but I can search for a community from it and it will come up

Just to test a theory: https://wefwef.app/posts/mander.xyz/local

This will show you the posts from mander.xyz as if you’re on that instance

Though I think these will leave not signed into your lemmy.world account, so I guess find the communities you like the look of and search it from your normal wefwef.app instance

You have to subscribe to the communities you want and then do “Subscribed” instead of “Local” or “All”. I don’t know of an easy way to mass subscribe though. The easier way is to click in “Communities” and search/subscribe those you want. You can search for communities in all instances there.