On the website, click on "my list" at the top of the page. If you are signed in, you can either Start a list or Edit your list. Or type your item in the search bar and click "add item to list".
In the app, select "My List" at the bottom of your screen and then "+Add Item" at the top of the next screen. Simply type in your item, or scan a package barcode. If it isn't recognized, you can easily add manually. You can also add items from the list view of our weekly ad.