Look at the top of your screen it should say:
Welcome, your screen name.
You last visited: Yesterday at 04:35 AM
Private Messages: Unread 0, Total 25.
My Mood:

where it says mood you should just have to click and a menu of moods appear. I am in google chrome and don't know if that makes a difference.

I jsut copied and pasted what was at the top of my screen so your last visited and private messages thingy will be different from mine