[xxcrapperzxx]

Does anyone know how you can create a banner and then make it your signature?

[Meowrocket]

Most people use fancy programs to make the banner, but you could use something as simple as Microsoft Paint, then upload it to the Internet to get a URL so you can place it in the signature. Other people all use something (I forget what it is) but personally I use Google Docs...
Then you go to the "Edit Signature" and then put the image URL: [img]URL[/img]
(I think)
Correct me if I'm wrong.