Signup pages use the stylesheet information already uploaded, so you don't need to alter any html code. They use the stylesheet applicable to the Group the signup page belongs to, rather than the Visp stylesheet. The image displayed at the top of the signup page, signupbanner.gif is set to be centered on the page, and can be replaced with your own image. The default image used for signupbanner.gif is below:
Our recommended size for signupbanner.gif is 600 pixels wide by 100 pixels high, although you can use an image of any size. You need to upload the signupbanner.gif image into the group folder relevant to the signup page. For example, if the signup page belongs to a group with the username of 'abc123' then you need to upload the banner image to 'abc123/images'.