When arriving at a store, the app will detect that you’re at that store based on previous shopping trips to that location. If there’s more stores in the vicinity, you may have to select which store you’re at using the sorting button top right.
Once the store is selected, the store appears next to the list name in the header. So far so good – but why does the list not filter out items marked for other stores?
That is intentional, you might want to buy stuff marked for other stores anyway. By design, we have chosen that filtering is manual – but it is really easy to invoke. You can automatically hide all items marked for other stores as described here.

Yes, there’s a short cut: Try to tap the list name in the header of the app 🙂

If the app reports that you the email is already in use when creating an account, you might already have an account. We strongly suggest that you use existing accounts instead of creating new ones. If you don’t know the password you can always reset the password

If you wish to login to the same account from multiple devices, you will need to setup a password.
You do this by logging out and then request a password reset from the login screen.
Once you’ve setup a password you can login using the email and password on multiple devices.

You can create an account inside the app.

Under settings, just fill in the fields highlighted in red (name and email).

This will create an account for you and the app is now logged in with the new account.