If you select ‘PayPal', and you already have an existing PayPal account you can enter your ‘Email’ or ‘Mobile number’ and press the ‘Next’ button.

Once you press the ‘Next’ button, you will be prompted to enter your password. Notice that you can also choose to change your Email or Mobile number by pressing the ‘Change’ link.

Press ‘Log In' after you have entered your ‘Password’ to get into your PayPal account.

After logging in, you will then get a success message that you have linked your account.