If you already have positions in the regular freezer, you can simply extend them into the 1.5X/2X Freezer:
1) Click on Freezer in the menu
2) Click at your desired freezer position on “Extend”.
There you can extend your desired position and choose between 1.5X and 2X.
For more Information about the Freezer Program, please check this article: Freezer Program in Overview