Go to Travel.state.gov. Click on "passports," which takes you to the Bureau of Consular Affairs' website containing the government's official and up-to-date information on how to obtain and use a passport.
Determine whether you need a passport card or book. Click on "Fees" to find the cost of your book and/or card based on your age and whether you are renewing or getting a passport for the first time.
Click on "Apply for Passport," and you will find instructions on apply for a book and/or card based on your age and if you have ever previously held one of these items. Depending on your situation, you may need to apply in person instead of online; this section of the website will help you determine that as well.
Hover over the arrow to the right of "Apply for a Passport" and click on "First Time Applicants." This section will give you the specific steps to take to apply in person, including filling out form DS-11. If you are renewing, click on "forms" and fill out the DS 82 online.
Gather all additional documentation requested on the website either to include in your mailed application for renewal or to show in person.
If you do not have access to the Internet or you have any questions while filling out the forms, call the National Passport Information Center at 1-877-4-USA-PPT (1-877-487-2778). The Bureau's website states that you can speak to a representative to ask any questions regarding the application process between 8 a.m. and 10 p.m. Eastern time, Monday through Friday.