1. Go to your UCP.
http://i34.tinypic.com/5d6jck.jpg
2. Click on the 'Profile' tab.
3. On the left side, click on 'Edit Signature'.
4. Put stuff inside the box to the right.
http://i33.tinypic.com/16a2ww4.jpg
5. Press the 'Preview' button, to check if everything looks good.
6. Press 'Submit', when your done.
I'm I cool now?