If you haven’t registered to vote yet you can do so online @ olvr.hawaii.gov . Online voter registration allows eligible residents to register to vote or update their residence or mailing address, or name through a secure website. You must provide a Hawaii Driver License or Hawaii State ID, and your Social Security Number. If you cannot provide these, you may submit a paper Voter Registration & Permanent Absentee Application by mail, or in-person.
The deadline to register online is 30 days prior an election by 4:30 PM. The 2020 registration deadlines are:
Primary: July 9, 2020
General: October 5, 2020
more info @ https://elections.hawaii.gov