You'll simply click the post, and it should give you an icon bar under the post. You'll then click the farthest left button on that icon bar, which looks like an arrow pointing to the left, that's the comment button sir. I know they don't give you any help unless your on the browser on your computer as you scroll across them they tell you the icon functions. If you have any problems just let me know, but simply put find the a little about yourself post in the forums, tap it (if your using your phone), tap my post about myself (which should bring up that icon bar under my post) hit the arrow pointing to the left, then type away my friend.