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

Once you click 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 clicking on the ‘Change’ link.

Click ‘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.