You can easily toggle your Cash Card Off from the Cash App by tapping on the Cash Card and toggling the "Enable Cash Card" switch to off. This will temporarily disable your card which is great for those times when you leave your card at the bar or restaurant!
If your card is Lost or Stolen and you need a new one:
Tap "Cash Card" or the dollar amount button at the top of the Cash App home screen.
Tap the image of your Cash Card.
Tap "Problem with Card" and follow the prompts.