did you click on the mood icon up in your little welcome box -?
up in the right hand corner?
looks like this below-

[Welcome, Jo55.
You last visited: Yesterday at 10:40 PM
Private Messages: Unread 0, Total 0.
Change Mood: My Mood: ] --{this would be the mood icon area showing on your screen}

If you have any PMs or notifications the mood icon won't show up there until you clear the notices.

If you can click the mood icon - sometimes the list is slow to load so give it a bit of time.

If it still doesn't work let us know what part you are having trouble with.