In the US, anyone at or above the age of 18, no matter their race, gender, or any other factors can legally vote in any election to determine the town, state, or nation's leaders.
The registration method differs based on the state, but in NH, you register at the polls on election day. If you haven't voted before, you need to bring a proof of identity and your register address. It's simple and doesn't take long at all!
Before voting day, be sure to do research on the candidates so you know who you support on certain issues!
On voting day, go to wherever your town holds elections, usually at a school or another well-known area. Once you register, you will receive a ballot. Fill out the ballot entirely, then bring it back and you are free to leave. This entire process shouldn't take more than 15 minutes!
It's important to vote because voting determines who will lead you. If the person elected can't do his or her job well, everybody, including you, will pay for it. It's better to take to small amount of time on voting day than deal with that!