If you need to sign up for your PTIN, just click the IRS link below:
They have a video and a simple 4 step process for registering.
If you need more help, here are some IRS phone numbers you can use:
PTIN HELP LINES
Primary Toll-Free: 877-613-PTIN (7846), then press 3
Toll Number for International Callers: +1 319-464-3272
Hours of Operation: Monday – Friday, 8:00 a.m. – 5:00 p.m. (CST)