If you are interested in a product and you want to add it to "my list" to order it later, add the product to "my list". Click on blue arrow beside any product to extend the options
Then click on "Add to List"
By doing that, you have added the wished product to my list and to access your favorite list, click on "My list" tab at the bottom of the app.
You will see the products you have added there and you can order them