For information about registering to vote, contact your town or city clerk. Contact information for town and city clerks are listed at http://www.state.nh.us/sos/clerks.htm. You can also contact the Secretary of State at 603-271-3242 or visithttp://www.state.nh.us/sos/electionsnew.htm.
Here’s an informational site set up by Granite State Progress and the NH Citizens Alliance: NH Voter Protection Voter Information Hotline: 1-888-939-5932
Here’s a link from League of Women Voters® of New Hampshire Elections page which has a lot of very useful information