Can you comment in the app?

I'm trying to write a comment on a certain page but can't seem to find a way to do it in the app.. is there a way to do this? If not there should be... I don't know why there wouldn't be 

Some people really just want to watch the world burn!

But no, you can't.

Correct. You have to use a browser version, but can log in on your phone browser.