Log onto your account.
On your Dashboard, click on 'Services' at the top of the webpage. From the list of options given, click on 'My Services'.
Find the service you want to manage email addresses on and click the three dots beside it on the right-hand side.
Another list of suggestions will pop up. Click on 'View Details'.
On the 'Managing' page, go down to 'Manage Account' and click on 'Email Addresses'.