Boost For Lemmy

This is maddening, what am I missing? In the hamburger menu in the top left, tapping on Guest switches to my username and loads the local communities feed, while tapping on my username switches to Guest and loads the subscribed communities feed. I can't seem to do anything with either my username or Guest -- no way to view my profile, posts or comments.

How do I get to my profile, saved posts and comments?

Also, does this app have an inbox/messaging feature? I don't even plan to use it, but I don't see it anywhere. I feel like a big chunk of the app is missing.

I tried searching and couldn't find an answer.