In order to change any of your personal information, such as  address, you must first log in using your user name and password, then click on your user symbol.
The user symbol will show the full account information.
Then click on "Account" in the left hand menu.
Then in the "Account Data" tab, your email address will be displayed.
To change email address, enter new details and Save
See link : https://www.admiralcasino.co.uk/en/user/personal-settings/account