Hello @marilyn2,
As of the moment, there isn't an integrated way to change the email address used to receive updates from us.
Normally, the email address used to sign up for the account will automatically receive the email notifications.
In the same manner, here's an article you can read to learn more about changing such information: Change your email, user ID, or password for QuickBooks Online.
On top of that, I've also included this reference for a compilation of articles you can use while working with us: Account Management for QuickBooks Online.
If you have any other questions, please let me know by leaving any comments below. I'll be here to lend a hand.
