There's no customisation you can easily do on that theme I'm afraid. The best I can suggest is that you wait until the new whizzy themes are finished which will be better in all regards, and feature more customisation! Should be released on here in the next couple of months.
(to be honest I'm not sure you are supposed to be able to select the School theme at all, since you aren't a school. I'll look into what's happened here...)
Joe - Voice Admin