Tap the green Scan button and point your camera at a barcode to put groceries away. For fruit, veggies and leftovers, tap + at the top.
This erases your pantry, list, history and settings from this phone. If you're in a household, it also takes you out of it; the household's pantry stays for the other members.
A subscription isn't canceled by deleting data. Cancel it in your phone's Settings › your name › Subscriptions.