Admins and managers can record a sick day on an employee's record. However, manager and employee user types can't add their own sickness by default. To allow managers to add sickness, their access rights must be elevated.
To elevate a manager's access rights for their employees' planners:
Click Access Button
then click Employee.
Select the relevant manager, then go to the Overview tab.
Click on Edit Access Rights, then select the filter Specific Employee(s) and add the user you want to elevate the manager's access right for.
To give the manager the highest possible access for each area, click Extended Access.
Set Employee Planner to Update or Update with Settings, then click Save.