To configure the boxes of the Win Calendar > click on the "Content" tab Win Calendar > import all the visuals of your boxes.

Once all the visuals of your boxes are imported > click on the first box's visual > indicate its landing page as well as the starting date and ending date for this box.

Once the starting/ending dates and redirection have been set up > go to the tab "Customization"

Enable edition to be able to position properly the boxes at the desired location as you can see below:

Once you put the boxes at the desired location > Stop the game edition.