To create your shopping list, first search product using the Search menu (available now on iOS, soon on Android). The search menu does not require internet access as it uses the embedded product database downloaded on your device for your country. Please note you should have created a Cajoul account to perform product searches, so if you are using Cajoul as a guest, please click on the Connect button to join the community first.
You could search product by name and add to your shopping list either a specific product or a generic category (e.g. "unskimmed milk").
On the product search list, click on the List icon to add the product or the category to your shopping list. Once added, the icon will grey out.