How to Reset Cash App Card PIN? Forgot cash app pin Using a Cash App PIN means you can manage money, and deal in Bitcoins, and stocks. But, if you don't know how to change Cash App PIN then you can't do anything. Why? Because due to security reasons Cash App asks the users to enter the PIN to complete the transaction. Until and unless a user enters the PIN, he/she can't complete a purchase or transaction. In case you have forgotten the PIN of your old Cash App account is not an issue. Read this post to learn how to access old Cash App account without a PIN. https://cashappscontact.com/blog/how-to-access-old-cash-app-account