If you need to update the 'owner' email address of your account, simply use the following steps:
*Note: Only an account 'owner' can update a new owner or add additional owners
Log in to your account (which is associated as the Owner)
Click the profile icon
Select Team Settings
Select Members
Select Invite button
Type in new email and invite (*skip this step if email already invited and accepted)
Once the invitation has been accepted, go back to Members
Select drop down menu next to the new email address
Change status to Owner
If you wish to remove the existing email associated as the Owner all together, follow these steps:
Log in to your account which is associated as the new Owner
Click on the profile icon in the top left
Select Team settings
Select Members
Click on the toggle of 'Owner' which is associated with the old email you which to remove.
Select "Remove from Team"
To Update Email Address in Billing Information:
1. Click the profile icon
2. Select Team Settings
3. Select Billing
4. Select 'Open Billing Portal' which will open a new tab
5. In the new tab find "Update information"
6. Insert new email address and billing details and click save