Adding Seats to an Active License
To add seats to an active license, log in as a License admin and:
Click Account at the top of the page.
Click Add Seats next to Seat Limit at the top of the page.
Enter the number of seats you would like to add. The cost for these seats will be prorated based on the amount of time left on your subscription. Payment can be made via credit card or purchase order.
If your license is no longer active, you will need to schedule a renewal instead.