1- View your profile clicking the "Profile" link up top. (to the left)
2- Then click on "Edit Your Profile", which is under #IRC and Contests
3- Scroll down to user preferences and where you see "Show Your Signature", click the radio button with the word "Yes" next to it. (You'll have the option to show other user signatures as well)
4- Once done with the option, click the save button and vuala.
Please, next time you post a thread, make sure it's in the correct section.
Feedback, Suggestions, and Support Threads like this belong there.
Edit: Beat to it by seconds lol.