Preparations

1. login to Admin Console
2. go to User Management → Administrators section
3. create new administrator

Part 1

1. login to Admin Console as root user
2. go to Configuration → Website → Advanced section
3. set value of Editing Window Style system setting (in Admin Console Settings sub-section) to the Same Window and save changes
4. reload frameset by pressing F5 (Windows) or Command+R (Mac)
5. click on username next to Logout link in top frame
6. confirm, that Editing User 'root' is displayed on blue bar

Part 2

1. login to Admin Console as administrator user, that was created above
2. go to Configuration → Website → Advanced section
3. set value of Editing Window Style system setting (in Admin Console Settings sub-section) to the Same Window and save changes
4. reload frameset by pressing F5 (Windows) or Command+R (Mac)
5. click on username next to Logout link in top frame
6. confirm, that Editing Administrator admin_username is displayed on blue bar (replace admin_username with username of created administrator)