I made a banner for my tumblr blog using the program "Gimp", but I am unsure of how to add it to my page. All I can find is tutorials telling me to paste the code to my html. I don't have a code, it's just a picture saved on my computer. I've also found tutorials telling me to upload it via a tab in customize called "heading". But the only options that are available on my theme are "Background" and "Sidebar". Does anyone know how I can upload it as my banner? I would really appreciate some help, thanks x