Start your household's list
Takes about ten seconds
Give it a name — whatever you call your kitchen. You'll get your own list with a printable code for the fridge door. No account, no password, nothing to install.
Keep the link
Whoever has the link can open and add to your list — that's the point of a code on the fridge. There's no password to recover it with, so save it or print the card as soon as you're in.