Touch ID is available for the National Bank app, but you need to set it up again after the app is updated. This option may not have been offered to you when you first signed up.
Not signed up yet? Tick the Remember me box. The app will ask if you want to activate Touch ID. This feature makes it easier to sign in next time.
Already signed up? Open the app, tap My settings in the menu
and then tap Touch ID to enable the feature.