Change your primary domain for shared accounts:
You have a shared account and need to change your primary domain name. You can do this by following this article.
Steps to change your primary domain name for shared accounts.
Step 1: Log in to your AMP account.
Step 2: Go to the Change primary domain icon and click it.
Step 3: Click on the follow up icon (that page will help you know the basic items and everything that will be affected.
Step 4: From the drop-down menu, specify the additional domain to change the primary domain to (if the domain does not exist, you can enter the domain name to type the unlisted domain)
Step 5: Once you have finished, change the base range.
Step 6: A confirmation window will appear in the AMP panel stating "Your primary domain has been changed"
Step 7: Log in to the cPanel panel to see the new domain within cPanel statistics
Within your email you can be sure to change your primary domain