No, its when you post a reply like you just did, at the very bottom of the page.
Edit: Your signature is to big, You will have to probably have to resize it.
Signatures:
Huge signatures make the board unreadable and very slow for people with a slow connection (not everybody knows that you can disable them in your profile). The maximum allowed signature file size is restricted to: 575 x 100 pixels. You have to take care of the hosting of your signature yourself.