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Hi Nahuel! Kristina from Moz's Help Team here. To change the owner of a particular account, you would need to login under the account holder's email address as the username, then navigate to https://moz.com/users/auth to change the email address on file. Similarly, to change the credit card on file, you'd need to login and head to https://moz.com/billing and click the "Replace" button next to the current card on file. If you need to reset the password associated with the account in order to get logged in, you can do that here: https://moz.com/lost-password. If you need further assistance with getting logged into the account, please email help@moz.com as we'll need to verify more information from you in order to assist. Thanks so much! -Kristina