Whether you choose to select a winner for one specific day in the Advent Calendar or just one winner for all the windows in total, the winner(s) will be crowned automatically in the system.
Just go to 1) Winners, and then 2) pick the date you want to select a winner for or click Total. Then 3) click Draw a winner.
Now the name of a winner will appear, and you will have to 4) Approve the winner. If you want several winners, just 5) click Draw more. You can also 6) announce the name of the winner of yesterdays window directly in the Advent Calendar. Here you will have to copy the name of the winner and paste it into the text box, along with a text to congratulate the winner. Then choose whether to 7) Show correct answer of the question along with the name of the winner. Remember to 8) click Save.