Alaska Online Voter Registration (OLVR): https://voterregistration.alaska.gov/
OLVR will let you register as a new voter in Alaska – OR – update your voter registration information, including party registration. So, if you’ve moved or want to change your registration, that is the place to go; 4-6 weeks after you make a change in OLVR, you’ll get a card or letter from the State letting you know it was processed. You’ll need your Alaska driver’s license number, by the way.
Not from Alaska? Check out VoteSaveAmerica.org, where they’ll help you figure out if you are registered or get registered in the first place!