As an admin you can enter or cancel vacation and other absences directly for your employees.
1. Enter leave for your employees
In order to do so go to "Requests/Request approval" and choose "+ Vacation & Absence" in the top right corner.
Here you can choose the employee and enter vacation or other absences.
2. Cancel leave for your employees
To cancel an already approved request as an admin go to "Requests/All requests", choose the entry concerned and cancel it directly via the edit symbol.