I couldn't figure out how to log on here with my other Fediverse creds. Rather than, like, Google or something? I just created new accounts for each instance. I'd say it's a boon for anonymity, but I used the same username, soooo
As of right now you can't access the "front page" of each instance, so that would be a valid reason to retain several accounts (among many other perfectly valid reasons).
How you go to different servers is just by subscribing or following a link to a community hosted on another server. So !Canada@lemmy.ca is hosted on lemmy.ca instead of lemmy.world, but if you follow it on a web browser you might notice it takes you to https://lemmy.world/c/canada@lemmy.ca
this way you haven't "left" lemmy.world, lemmy.ca has no access to your credentials but you can make a post or comment there which is shared with lemmy.ca who posts it for everyone who connects to lemmy.ca to see.
Hi there! Looks like you linked to a Lemmy community using a URL instead of its name, which doesn't work well for people on different instances. Try fixing it like this: !canada@lemmy.ca