I don’t really understand how to subscribe to an instance that is hosted on a different server?

Like say I want to subscribe to this instance https://feddit.de/c/600euro how would I go on about not just being able to see it but have it in my feed too?

Which app is most like RIF? I’m using Jebora currently.

Also it looks cool af which is a point not to be neglected.

Vampire Survivors for sure! It’s a very chill arcade game and it’s like 2-3€ when on sale.