You will see that there are check boxes next to each product now. If you want to put that on your shopping list, you simply click the box and it will appear on your shopping list. The shopping list is on the bottom right side of your screen and will pop up as you add items to it. The items will stay in your shopping list only while you are on that page. If you navigate to another page the list empties. When you have checked all of the items you want, then hit the print button and your shopping list will print out for you.
Let me know how you like it and how it works for you. There will be some adjustments and changes made as this was just installed last night.