When you arrive in the calculation screen, it is empty:

Enter the number of days to be paid on the line No. of normal days in the employee column. (In the case of quantity items, it is not necessary to enter anything in the employer column).

If you want to pay for 3 days, type 3 in the employee part and press tab to validate:

Click on Compute

The calculation will be done according to the master data stored in the employee management.