It's actually crazy the way they've laid this out, it's really misleading. The button to edit the school and information is right next to your name, and it's not intuitive to think you would need to edit that. Plus, all of the other information is collapsed, so you can't really see what your options are to edit things. This interface should be changed!
But if you follow these directions and really look for the information on the window of Expenses for School Summary (and the Add School part below), you will see the edit button right next to your name. This response was best.