Are you making a graphic, or are you getting signature ticker code from a website?
Go to your UserCP... Edit Signature...
If you have ticker code from a website such as our own weight tracker or the ticker factory, then paste the code into the signature field.
If you have made an image that you want to upload to appear as your signature, then scroll down to the bottom of the "edit signature" page and you'll find an option to upload the image to our server. It will appear on future posts
The image you upload can be no larger than 100px high, 500px wide, and 19k in size.