While Netflix is available on many devices, you must use the Netflix website to change your payment information. To pay with paypal use the below process
Sign in to your account on the Netflix website.
Click “Your Account.”
Click “Update” next to your payment information.
Click the radio button next to PayPal and click “Continue to PayPal.”
Enter your PayPal username and password and click “Log In.”
Click “Agree and Continue” to update your Netflix account to make your monthly payments by PayPal.