Hello Claudio,
Thank you for your question about updating your ID. All you need to do is click "Sign Up" on our home page. When you "Log In with eBay," it will detect the change and update your userid accordingly.
If this isn't successful, let us know and we can take the next step with you. But it should work fine.
Please let us know if you have any other questions, or require other assistance. We are happy to help.
bidslammer