The application is a simple list viewer which displays the preconfigured items as a bulleted list. You can have it open and save shopping lists but you can create or modify them on the fly to suit your needs.
You can manually type in items to add to the shopping list or you can type up a list in Notepad or something similar. If you want to import a list in the application just save the file as a text file with each entry separated by a carriage return (new line / Enter) and copy it to your device. Then, in the application click File and Open and browse to where you copied the .txt file