Access Account Settings: Click on your name in the upper right corner and select "Account Settings."
Add Your Custom Domain: Scroll down to the "Custom Domain" section and enter your preferred domain.
Configure Your Domain Provider: After saving, go to your domain provider and create a CNAME record that points to your Emailpref domain.
You need to point to your own Emailpref domain, below is just an example.
Custom Domain
Point CNAME (Just an example)
Please note: It may take up to 24 hours for the SSL certificate to be generated.
Important: Your Emailpref domain will remain active, so any emails previously sent using it will still allow customers to access your preference pages.