If you do not have a passport or if your passport has expired, you need to either obtain or renew your passport. Most countries require that your passport is valid for at least six months after the duration of your stay in order to be allowed to enter their country. Ultimately, it is your responsibility to obtain a passport that will legally allow you to travel abroad. With all of the above in mind, it is a good idea to ensure that you have a passport that will be valid for some time well before the study abroad program that interest you departs. It generally takes a minimum of several weeks for the US Department of State to process passport applications. Consequently, it is advisable for you to send your complete application materials to the US Department of State as early as possible, even months in advance if possible. If you wait until the last minute, you risk paying extra in order to expedite your passport application. You can find passport application information at your local US Post Office.

You may also find it online at the following website:
https://travel.state.gov/content/passports/en/passports.html