Go to "My event", where you will find 2 green arrows on the far right of each product line. The arrows point in opposite directions and are next to the waste bin. Click on the 2 arrows and choose the new zone from the dropdown menu. Then click on "Save".
Click on a product photo in the overview, this will take you to the detail page of that product. Via the button "Add to event" the product appears in an overview on MY EVENT