Hello,
You can find the AIU APA Template on the APA LibGuide located here. You can find links to this libguide on the library webpage at the bottom right, as well as on the Learning Center web page. The link is shown in the screenshot below as APA Citation Resources.
Once you open the APA LibGuide, you can find the APA Template on the left, in the Top Links box (shown below)
AIU only provides an undergraduate template, as they want graduate students to be able to set up APA formatting for themselves. The APA LibGuide also has sections that provide help with formatting, setting up the title page, and with APA citations.
In case they are helpful, here are some additional videos on related topics:
I hope this helps! Please let me know if you have any other questions.