Mobile usage is pretty straight forward. Here are a few things you should know
1. You cant see/use the reactions
2. The quote/edit function is being worked on right now and should be up soon but is unavailable as of now
3. To speed up your browser in mobile, its probably best that you turn off signatures. To do this, go to your profile, then edit my profile in the upper right hand corner, signature settings, Hide signature always.
4. You are able to change your profile pic in mobile
Any other Mobile related questions, feel free to ask in this thread. Peace