An employee can be set as a manager from the tabs Employees>Groups>either click +Add Group to add a new group for your manager, or click the blue Edit button to the right of an existing group name.
Under the Manager field box select the users who will manage this group>click the blue Save button to save all changes.
From the Employees tab, all managers will have an orange Manager tag next to their name. Click on the orange Manager tag to see what groups that user is set to manage.
For information on creating managers and groups, see Adding a Manager and Group - User Roles
For more information on how to add employees, see Adding Employees