Sad on, you must have been in a hurry to forget your cash app pin. this page has details on how to reset and recover your cash app pin.
Sending money on Cash App is quick, effortless, and free; until you forget your Cash App PIN.
Cash App works like most other payment apps; you’ll need to set up a PIN to use the payment features on the app. When you have the PIN set, you’ll need to enter the PIN each time you need to send money.