You may do this by adding PayPal to the checkout profile that you are using for your items. You may create a checkout profile by going to "Items" --> "Profiles" --> click "New" and select "Payment" --> then click the "Add another payment method" button --> select "PayPal" from the "Type" drop-down box and enter your PayPal email address into the "Account" box. Please let us know should you have any trouble with this.