You have to go into your web file system, select the themes folder, select the theme you are using, then find the picture which is your banner and upload/replace it with a new banner with the same name. There could be multiple files that are the same picture and you have to replace them all to make sure.
Under the theme editor you can find the header file I think you can edit the words shown. I haven't used it in a while myself so I'm not entirely sure on the specifics.
Under the theme editor you can find the header file I think you can edit the words shown. I haven't used it in a while myself so I'm not entirely sure on the specifics.