Took me a year to find this info and figure out how to cancel my auto pay!

Customer Service Email: support-billing@ultimate-guitar.com
Customer Service Phone: 415-599-4620

Guide removing subscription through PayPal.

1. Login your paypal go to My Account tab.
2. Click Profile
3. Click My Money tab.
4. Update your My preapproved payments
5. Click/Find Ultimate Guitar USA LLC
6. Cancel it.
7. Done.

Good luck!!
Have a great day!