Many states offer online services that can help you look up your local voting site. Others list contact information for local election officials, who are trained to help you find your polling place. Select your place of residence in the drop down menu in this link.
You may be eligible to vote prior to the election as an absentee or early voter. State laws vary greatly, so be sure to pay attention to the information provided by your election officials, or contact your local election office for help. Use this link to find your local election official policies.