You may wish to add / remove users from your subscription, you can do this yourself by changing a number.
- Log In to the Salesforce AppExchange.
- Go to My Account.
- Next to fileIT click on Modify Subscriptions.
- In the Users box enter the total number of users you wish to have licenses and click Save.
Please remember the number of users you enter is the total number of licensed users you want on your subscription.