The 1998 Higher Education Act requires all postsecondary institutions to make a good faith effort to distribute voter registration materials to each degree or certificate seeking student.
Arizona residents can download a voter registration form or register to vote online at: https://azsos.gov/elections/voting-election/register-vote-or-update-your-current-voter-information
Students residing outside of Arizona who wish to register to vote in their home state may do so by completing the National Voter Registration Form provided by the US Election Assistance Commission.
Remember that each state sets its own registration deadline. Most are around 30 days before the election, although some are closer to Election Day. It's a good idea to double-check the election laws with your state or local elections office before you start.