|14 day free trial account comes with 5 licenses, 2 are already assigned, one administrator and one field worker. You have 3 licenses left to configure they could be any kind of users: Administrator, Manager or Field Worker.
To learn how to configure a user click here
If your test requires more than 5 licenses please follow this procedure:
Click on "Configuration" --> "My Account"
Click on "Change"
Please enter the number of licenses you need and click on "Save"