Q: How do i cancel apple i tunes service

Hello Gale,

Thank you for using Apple Support Communities. 

I see you are asking about canceling your "Apple iTunes", but I am guessing that you actually mean Apple Music membership. The following article will provide you information on managing your membership, to include canceling (turn off Automatic Renewal) it. 

Manage your Apple Music membership on your iPhone, iPad, iPod touch, Mac, or PC

Best regards.