Visit https://www.vote.org/register-to-vote/ and follow the instructions to register online.
If you would like to check to see if you are registered to vote, click
www.vote.org/am-i-registered-to-vote/?gclid=EAIaIQobChMIkt-GxqPp6wIVibLICh33HwHmEAAYAyAAEgIg8_D_BwE
Visit this website : https://sos.nh.gov/elections/voters/register-to-vote/absentee/accessible-voting/
The Absentee ballot application is available and should be returned to a town clerk in person or by mail.
Include copy of valid drivers license/other form of ID with the form.
The ballot needs to be "received by" Tuesday, September 8th. However, the post office suggests that ballots are mailed at least two weeks before. Even though this is true, mail it as soon as possible to make sure it is received in time.
Make sure your signature matches your drivers license
Make sure the bubbles are filled in completely and correctly