Be careful changing the credentials for this. When you login to the TDS Web Admin Tool and attempt to change either the user name or password for the superuser (default superadmin) I have seen cases where something got screwed up and the end result was to uninstall and re-install the TDS Web Admin Tool completely.
It seems that the tool is a little quirky if you try to change the user name and password at the same time. My best recommendation is to change the username, log out of the tool, then log back into the tool with your new user name and the original password. Then change the password for the user. Log out of the tool, then back in with the new user name and new password.