Hi Derrick, and welcome to Tiki community
Alternatively to what Marc has suggested, you can also fix that, as far as I know with the installer, so you can re-run the tiki-install.php, and at some of the steps, it will allow you to grant admin rights to the admin or whatever other user you need them to have admin rights.
Hope this helps
Xavi (another teacher using tiki in his classrom)
P.S. Btw, did you know http://edu.tiki.org ?