It is possible to change the email address you use with Link My Books.
The new email address must be linked to either a Xero, Intuit (QuickBooks) or a Google account, as these are the sign in options for Link My Books.
Firstly, from your existing login, you will need to add your new email address as an additional user on your sales channels. If you are unsure how to do this please see our help article:
You will need to accept the invitation and sign in via the new email to complete the set-up of adding the new email to your account.
Once your new email is set up as a user, you can move your sales channels across to it yourself — there's no need to contact support. From your current login, transfer the ownership of each sales channel to your new email address; once the new email accepts, the channel moves across automatically.