I am a high school student and that's what my high school uses... I'm just so confused as to how to do it...
On the first settings page, enter your e-mail address at the school, your school domain\username.. e.g. School\Earlet9 and your password that you use to access your mail. It will try to automatically configure exchange for you based on your e-mail address and will most likely fail.
If it fails, you'll be brought to a screen that looks like the one below
Just fill in the server address with the url you use to access outlook web access (minus the http, etc.) enter your user name and your password and hit next. You may get warned about the server not having a certificate, just agree and it should say "verified exchange setup" or something similar and start syncing your inbox, etc.