Navigate to the Product page and search around for the products you have manually added to your lists as well as your most used products.
In Υour library find the products you have added to your lists through the bookmarklet or the “add a product” functionality.
Edit the data of these products, if necessary or delete a product completely from your lists.
In the Most used collection retrieve the products you have used so far, sorted by frequency, regardless the way you have added them in a list (manually or not).
Click once on the desired products above to send them automatically to the box on the right.
Then select the little green bag and create instantly a new list with your custom products (1) or append them to a existing list (2).
Really functional, isn't it?