How can I change gateway username from admin to email address?

If you have one of these devices G34, G36, SBG10, SBG6950AC2, SBG7400AC2, SBG7580-AC, SBG7600AC2, SBG8300 you can set up the Surfboard central app and use your email address, then your admin username will be your email address instead of admin

thanks.

i still had to reset everything.

All good.  Thanks for replying.