Thread:Sarah Manley/@comment-4978605-20121121234354/@comment-4674838-20121128012347

Have you read the favicon help page? That might answer some of your questions. For example, favicons must be saved in the ICON format (filename ends with .ico) -- that would explain why you're not able to use "File:Gabi.jpg" because it's not saved in the ICON format.

If you need to convert an image to an .ico file and you don't have Photoshop / other image editing software that can do it, try doing a google search for "favicon generator" and one of those sites might help you.