Not a stupid question at all - the way you do it isn’t intuitive, and I hope gets made easier with further software developments. In the search bar near your username at the upper right enter, communityname@instancename, for ex. newcommunities@lemmy.world, and if it’s working right the version of the community that’s synced to kbin will show up. Catch is that right now it randomly seems to glitch, and fail or return nothing, so if doesn’t work at first you’ll just have to try again later. I’m sure the people running the site are aware of the issue and trying to get it sorted out, for now it’s one of the things to put up with a platform that basically started last month.

For example, here is one I just made that gathers general music communities across instances: music groups