if you hit the "Reply" buton at the bottum right corner, then it shows you all the things you cab do. In the reply page, hit the button that looks like a picture.
[19:34:14] RideWarriorNation: jim
[19:34:27] RideWarriorNation: can you pls change sig
[19:35:22] Jcoasters: ok
[19:35:39] RideWarriorNation: ty