After you log in to the web interface here, if you push the 'Settings' button, near the top of the page, you get a new page. On that new page look for 'Transfer your mirror subscription to another ebay username.' in that section you can select a link to the 'Mirror Transfer Form' and that will allow you to do the changes you require.
During the process you will be required to have access to the email account that was associated with the Paypal account you used to pay for the subscription.
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