Users can be (un)assigned to teams in the Users module, in either the "Teams" or "Users" submodules.
How to assign:
Option 1 - in the Teams submodule:
Users can be assigned to the team either by going to the list of all teams and selecting Assign users in the Actions column or by going to the single team detailed view (by clicking on the team in the list) -> Users tab and click the Plus button to add more users.
Either way, a popup will open where you can search for users and add them to this team.
Option 2 - in the Users submodule:
Alternatively, users can also be assigned to a team directly in the Users tab, by clicking on the Actions column and selecting the option "Assign to team".
How to unassign:
Option 1 - in the Teams submodule:
Users can be unassigned by going to the detailed view of the team (by clicking on a team) -> Users tab, clicking on the Actions columns of a user, and selecting the Unassign option.
Option 2 - in the Users submodule:
Users can also be unassigned in the Users submodule, in a user's detailed view (accessed by clicking on a user). In the Teams tab, click the actions columns of a team and select Unassign.