You are logged into your user account as a coordinating teacher.
Click on the green bar "Find out the results of the 2020 contest here!" and then select the participation of 2020. Alternatively, you can find the button "The Contest " on the left hand side and click on "Final results". You can then tick the small grey box for each pupil and select the correct class by clicking on "Add to a class" (above the table).
If you have not created any classes yet, here is a short step-by-step guide helping you to create them.