Web app In the navigation click on the airplane symbol (absences). Then move the mouse over the person on the left you want to create an absence for. This will cause a green plus button to appear. Click on this button to open the out of office popup. Here you can now select "Illness" as the type and then the period. Finally you click on "Save" to create the entry.
Alternatively, click and pull the mouse over the days you want to set up an an absence in. Mobile app Click on the 3 bars-icon in the lower right corner in the navigation. You can then click on the "Absences" option in the menu. Here you can click on the plus symbol in the upper right corner. Now select the employee and then "Illness" as the absence type. Now you only have to select the period and then click on "Save".