You must be logged in as an administrator. Click the gear-shaped button in the top task-bar (circled in blue on the right) to open the administrator settings menu.
On the first tab, “User Administration”, you can create a new user by setting up its name, its password, and define whether or not the user will have the “administration” permissions (including applications, users and service management).
Submit the form to create the user. You can manage existing users from the “users” tab.
Please note that the Proline Web Desktop has its own database and its own users collection. However, if you configured the Proline Service running inside the Proline Web Desktop, it will synchronise the Proline Web Desktop and the Proline Core users each time a user logs in the Proline Web Desktop: