Steps
Click Settings in the bottom-left corner
Go to "Subscription" or "Seats"
View your current seat allocation and usage
Click "Add Seats" to increase your paid licenses
Enter the number of additional seats you want
Review the prorated cost for the remainder of your billing cycle
Click "Confirm" to add seats
To remove a seat, go to Workspace Users and remove a paid member
Notes
Each paid member requires one paid seat
Adding seats is prorated to your current billing cycle
Free members don't consume paid seats
Removing a member from the workspace frees a seat