You can find yourself on lemmy.world by entering the full URL to your profile into the search field, i.e. "https://kbin.social/u/HamSwagwich". This should yield this user page: https://lemmy.world/u/[email protected] (Since I'm reading this from lemmy.world I can click on your name below the post title to get to this page, too).
Something similar applies to magazines/communities. Instances don't know about all communities everywhere by default, so the first time someone tries to access a remote community, it has to be a search by URL (at least on the lemmy side), i.e. "https://kbin.social/m/TeslaMotors".
Now that I did that once, that community in particular will show up in a normal community search on lemmy.world too. But no existing posts have been imported (yet).
I'm very confused as to why you need to put the entire URL, including the https in there? That is so very counterintuitive, is there any explanation for that?
With that figured out, do you happen to know why none of the posts are showing up (or any of the subscribers, etc?) ... for example, the TeslaMotors has been in the pending subscription state for over 24 hours now.