You must be logged in as the CloudCall portal administrator
When logged into the CloudCall portal, on the left hand panel, navigate to profile > departments
You will see a list of the departments you have already created. To add a user to a department or make it their primary department, you can do this quickly by hovering over the department and clicking on the people icon
Another window will pop out. Under the add column, tick all the agents you wish to add to the department but do not need it to be their primary department.
Under the primary column tick all the agents that need the department to be their primary department
You do not need to click save, it updates automatically.