Once the licenses are purchased, user can manage all licenses by using "Subscriptions" menu from the left hand side bar as shown in the figure below:
The license management section will be available by clicking on the LICENSES link as shown below:
By clicking on this link, user will see the license area:
By clicking on the pencil like icon, user can grant and revoke the licenses. Note: please make sure that the user is added by clicking on the +ADD button as shown below before attempting to grant new license:
The grant/revoke of the licenses can be done using the toggle buttons as shown in the screen below: