If you're logged in on the website, those links should "just work" and the subscribe button is in the sidebar. Mobile website also works really well although you have to expand the sidebar to see the button.

If you're using one of the many different mobile apps you'll have to let us know which one because they all seem to work completely differently at the moment!

Edit: Just realised you're on Kbin and it looks like Kbin is stripping the link formatting out of the post for some weird reason, that's why you can't click them 🤦‍♀️

These are links with an "!" at the beginning. You should be able to copy and paste that into the search bar on your instance to search for it. The "!" will force your instance to search for it in other instances I'd no other users in your community have subscribed. If you click the link from your search results, you'll access the community from your instance and then you'll be able to subscribe in the sidebar.

If for whatever reason the subscribe button is not working, and you click the button to create a post and just return to the previous page. It's a known bug that depends on the version number of the instance.

You're on a kbin instance, and it is the main one so most of them are probably already there. If any of them is not, just click the search button at the top of the screen and enter the name you see above without the ! and without the space before the @. e.g. "[email protected]", your instance will then look it up and subscribe you to it if found.

It might take a while for threads to begin to appear if it wasn't already there though.

Works exactly like Reddit. Open the community of interest and press the subscribe button lol