Facebook requires that you use a personal Facebook account to create and manage business profile/pages.

1. Log into your personal Facebook account.
2. In the left sidebar, click the title "Pages".
3. It will then either list out all of the pages that you manage, or take you straight to your page.
4. In the top right, click Settings.
5. Next, select Page Roles from the left side bar.
6. Enter the email of your account manager here. Be sure to select Admin as their role.

Your done!