You are registered on lemmy.world - that’s your instance.
The accidental renaissance community is separated into two distinct communities: one on kbin.social, and one on lemmy.blahaj.zone
You can access both communities using your lemmy.world account, but you need to edit the URL a bit to ensure you remain on your home instance (lemmy.world):
So instead of going to
lemmy.blahaj.zone/c/AccidentalRenaissance
for example, you need to instead head over to:
lemmy.world/…/[email protected].…
lemmy.world/c/[email protected]
You’ll notice that we append @the_name_of_the_instance_the_community_is_located_on to the end of the URL. Obviously, you don’t need to do this for communities hosted on lemmy.world since… you’re already here.
You can also link them in comments easily using an exclamation mark, e.g [email protected] and [email protected]
There are ways to automatically ensure you’re always on your home instance, so that this is less confusing. Personally, I use the Lemmy Universal Link Switcher script via the Tampermonkey browser extension. This ensures that all lemmy links are changed so they always lead to my home instance, lemmy.world.