There is no direct way to Send Money from PayPal to Cash App account. The alternate method is to add Cash App card to PayPal and then send money to the Cash Card.    

Follow the steps:- Open the PayPal app on your phone. The icon of PayPal is white “P” outlined on a blue background icon. Click ‘Transfer to your bank’. It is located just below your PayPal balance. Select the bank account that you wish to transfer money and click ‘Next’. Enter the amount you wish to transfer and click ‘Continue’. Review the request of your transaction and then click ‘Transfer’. It will be completed by the following day if the transfer initiated after 7 PM ET. Hope this helps.