do you have access to phpmyadmin, or something similar? if so:
open phpmyadmin, click on the database name on the left side, click on xxxxx_users, then click the 'search' tab on the top of the right side, enter '42'' in the 'id' box, and click 'go' below (don't change any options) and it should show that user on the page, click edit, then you can change the name, username, email, from there, then click go again, and you should be done
(replace xxxxx with whatever it needs to be for you)
i like to modify things, and make them do unintended things