In the United States, in order to be able to vote, you must first look up the requirements in order to be eligible to vote. If you are indeed eligible, you must update your address and contact info in order to be sent to the closest place to vote. Then, it is mandatory for you to register yourself to vote. You cannot decide to vote the same day of the election. There is a deadline to registration before elections are held. Once you are registered, you will be informed of the place and time of voting. You must present yourself personally with an official ID to corroborate it is indeed you who is voting. After they've checked your identity, you will be able to vote anonymously in a general election.