If you've paid for Xanga Premium using PayPal, you can cancel your ongoing subscription using the PayPal website:

1. Log in to your PayPal account.
2. Click the History subtab.
3. Choose the Subscriptions field from the Show dropdown menu.
4. Check the From box and change the date back 2 years.
5. Click Search.
6. To view the details of a specific Subscription Creation, click Details in the Details column.
7. At the bottom of this page, click Cancel Subscription.
8. On the confirmation page, click Cancel Subscription again.

After you cancel your subscription on Paypal, you will be notified by Paypal of the cancellation and you will not be rebilled on that username. 

Details:

Just to explain how the premium subscription works, all Premium service plans (except gifts and payments by personal check) are automatically renewed at the end of each service period.  For example, if you buy a subscription for 1-month of Xanga Premium on January 1st, you will be automatically rebilled for 1 month of Xanga Premium services on February 1st.

Further details are covered in the Premium Service Agreement:

• http://help.xanga.com/about/premiumagreement.htm

You can also see your own billing date by logging in and visiting your premium account info page.

• http://www.xanga.com/private/editpremium.aspx