I'm very sorry but would you mind clarifying a little further what exactly you are wanting to do with the Paypal account? Are you referring to receiving your earnings via Paypal or paying for upgraded membership billing? If you could share some additional details, we'll be glad to help.
If you have set up Paypal as a method of receiving payments, then Upwork will send those directly to your Paypal account. What you are able to do with those funds once they are in your Paypal account is not in Upwork's control and you may need to get in touch with Paypal to learn more about what options they have available for you to withdraw your funds from Paypal.