If you have paid for a group of seats and you need to assign them to other users in your firm, this can easily be done from the Manager Users page.
To access the manage users page, click on the image to the right of your name and select Subscription.
Once you are on the Manager Users page, click on the Assign Seats filter. From the Assign Seats list, click Add next to the person you want to assign the free seat to.
A confirmation screen will be displayed. Click Confirm if everything looks correct.