How do I know if I am logged into Amazon Seller Central with the main account?

How do I know if I am logged into Amazon Seller Central with the main account?

The email address you use to log into Amazon Seller Central determines if you are logged in with the master account also known as the main account. 

You can verify the email address that is on file in Amazon Seller Central by using the link here. On this page, you will see the email addressof the master also known as the main account. If you're using this email to log into Amazon Seller Central then you are using the main account.