Questions re the android app

[Facebaffle]

I've been sticking with the app rather than the mobile site but I'm getting frustrated over a couple of ishoos.

Why can't I change OP posts and my own posts to a different colour?

Why can't I delete threads? (I've constantly got the xmas thank you thread and November Tash thread at the top of my active list and can't get rid).

Are these things that will be fixed in time?

Thank you