Thread:RRabbit42/@comment-5085954-20130725084100/@comment-961279-20130728233937

The picture needs to be 250 pixels wide by 65 pixels tall. If you use the PNG format, you can make the background transparent. Once you have the picture completed, you use the Theme Designer on your wiki to upload it.

I usually make the picture about three times as large so I can make sure it looks good, then shrink it down to the 250x65 size.

If you need help making one, let me know.