Head on over to the Earnings section and click Subscriptions. That will show you all of the subscriptions you currently have with Spare Music including the renewal date for each subscription.
If you wish to cancel any of your subscriptions, just click the cancel button on the right. If then you decide you made a really bad choice, just click the resume button.
When you cancel a subscription, you will still have access to all of the features on your account up until the expiry date of the subscription.