You can create your account and get started with application here: https://rpr.irs.gov/datamart/mainMenuUSIRS.do
You can also access the PTIN System by going to www.irs.gov, click on Tax Pros in the top right corner, then click the Renew or Register button on PTIN System.
TIP: If you have an issues applying for a PTIN, contact the PTIN Helpline at https://www.irs.gov/tax-professionals/contact-the-return-preparer-program.
If you prefer, you can mail in Form W-12 to the IRS rather than use an online account, but your renewal will take four to six weeks to process. If you do choose to mail in the form, send it to this address:
IRS Tax Professional PTIN Processing Center
1605 George Dieter PMB 678
El Paso, TX 79936