Guide or FAQ for mobile app (for Digg features in general)?

Hola! PC browser user trying to find stuff on the mobile app here. Is there some kind of guide somewhere? Actually I have a few questions I'm trying to answer.

How to hide communities on the app? The three dots on the app only gives me join or share options.

How to quickly access a list of communities on the app?

Search question for both app and browser - The search function seems to only hit community and user names, and not post content. Is there a different search for post contact? This may be a "we're still building stuff" issue, but making sure I'm not missing something.

Thanks in advance!