All users in SalesScreen require a user license. To add a user license, you need Account Owner access privileges.
If you don't have the necessary access levels, you will be presented with a list of Account Owners when you try to add a user to SalesScreen and you don't have enough available licenses in your account.
Adding more licenses to your subscription
Go to the Subscription page
You are presented with a page that lists your subscription details, your number of active users, and Account Owners in your SalesScreen instance. Click the Add Licenses button in the top right:
The current subscription(s) for your account will show up. Press Add Licenses for the subscription you want to add more licenses to.
You will get a summary of the cost of the licenses you're adding, and the total amount for your subscription
Press Confirm, and the transaction will go through:
Changes in future billing will happen according to the terms and conditions of your subscription.