You are pulpy@feddit.it meaning your account is registered on feddit.it

I don’t use Jerboa so no clue on that one!

On the left-hand menu you can see your login name at the top, and add multiple accounts.

I experienced the same issue. It should be easy to see your name and instance. No reason it should be hidden, is there?

Press on the three vertical dots on the top right and select “Site Info”. An info tab should open and at the top, it will say [your instance name] Info. Hope this helps!