To change your PayPal email address, go to 'Settings' in the app menu and select the PayPal account option. You will be asked to enter your PayPal email address and tap 'Send verification email'.
Check your email inbox and enter the verification code you’ve received into the app. Then tap 'Submit', and your PayPal account will be verified. If you didn’t receive the code, you can press 'Resend verification code. Don’t forget to check your spam folder if it doesn't appear in your inbox!