which State do you live in? I am assuming you are going to get PCC from an Indian Consulate in USA.
Depending on your state, you have to choose one of the Indian Consulates at:
1. Chicago
2. New York
3. Washington DC (Indian Embassy)
4. San Francisco
5. Houston
and a couple more...
Here is the embassy address:
http://www.indianembassy.org
From here, you should get links to the various consulates in USA. At each consulate website, you would find a list of States under that consulate's jurisdiction. You can look for your state. Or, try to figure out which consulate is nearest to you, and go to their website and confirm if that is your consulate.
Next you have to download their form called "Form for Miscellaneous Services"
Fill up that form for each applicant, attach passport photo, and send the form to their address, along with $20 application fee for each applicant, and a copy of all pages of your passport. But be sure to call them and find out all requirements before you send in your application.
The process takes about 45 days for passports issued in India, at the end of which you have to send the passport of each applicant, along with $20 for each applicant, for the issuance of the PCC.
So, your first step is to determine which Indian Consulate your state falls in the jurisdiction of, and proceed from there.