The card you have on file with your Apple ID will get charged either for the $9.99/month or the $14.99 per month family plan, this of course, depends on what you chose when you signed up. You can either cancel your subscription completely or just set it to not auto-renew, so that you can make that choice whenever you want manually after the three-month period is up.
There are two ways to do this, through iTunes or with the new Apple Music app you’ve downloaded.
iTunes:
• Click on your account in the upper right hand of iTunes — this should have your name or Apple ID on it.
• Navigate to “Account Info” and then settings, and click on “Manage” beside subscriptions.
• Click “Edit” which is located next to “Apple Music Membership” — if you have multiple subscriptions.
• Hit “Off” next to Automatic Renewal
iOS:
• Click on your account — again, the silhouette icon, on the upper left hand of the Apple Music app.
• Next go to “View Apple ID,” then scroll down and hit “Manage” under the Subscriptions section.
• Toggle the “auto-renewal” option to “Off”
In either scenario this isn’t too tricky to do, but you might want to set a reminder for yourself for Sept. 29, or just switch it off now so you have no nasty surprise bills later.
by Mary Beth Quirk via Consumerist