How to add a twitter background?

[bdubz87]

If your photo won't upload, try these things:

Check your file type. Twitter supports JPEG, GIF, and PNG file formats. We do not support animated GIFs. All existing animated GIF images will be left as they are, but no new ones can be uploaded. Profile photos with nudity will be removed.
Make sure your file is the correct size. Your photo must be no more than 700k.
Make sure your browser is up to date. Try upgrading your browser or using another browser. Your upload problem may be related to the browser or computer you're using.
Make sure you click Save changes at the bottom of your Profile settings page. Your image won't save until you click that.