How do I create, edit or delete a list?

You handle everything to do with lists in the list overview (the home screen with all your lists):

• New list: tap „⋯“ at the top right → „Create new list“.
• Rename or edit: swipe left on the list and tap the pencil.
• Delete: swipe left and tap the trash can (when you only have one list, delete is hidden).
• Reorder: „⋯“ at the top right → „Sort lists“.

By the way, for everyday use you usually only need a single list — it can hold several supermarkets at once.