If you need to cancel your Rdio account, you can do so at anytime — simply log into your Rdio account and edit your settings.
Make sure you click this link from a computer, not a mobile device. If you’re having trouble clicking the link, try copying and pasting this link -- http://www.rdio.com/management/subscriptions/ -- into your browser.
To cancel, click on the gear icon next to your name in the upper right-hand corner. Choose Settings from the drop down menu. Then select the Subscription tab from your Account Settings page.
From there, scroll to the bottom of the page, and click Cancel Subscription.
Once cancelled, your account will not be billed again and your subscription will remain active until the end of your current billing period.