User blog comment:Mizukawa Minori/Help in Signatures/@comment-3323804-20130309035752

Sig tutorial - It explains the coding and how to do different colors and fonts, although it doesn't explain how to add an image, but I believe all you have to do is add the picture. Although, you may want to sidestep the "How to set up and Use a signature" since it can vary from wiki to wiki.