Note: This article explains how to sign out of your Haystack account on your app so you can sign in with a new account. This is NOT how you cancel a paid account.
To sign out of your account on iPhone:
open the app in the main screen of the app (card list view)
Tap the 'settings' icon at the bottom right corner of the screen
Tap on your current account at the top of the settings screen and choose 'sign out'
To sign out of your account on Android:
open the app in the main screen of the app (card list view)
Tap the 'three horizontal lines' icon at the top left corner of the screen
Choose 'Settings', scroll to the bottom and tap 'sign out'