How do I remove Shipping and Handling in PayPal?

I'm testing out the Membership Plugin here: http://jaimelacmegantic.com/devenez-membre/

I like it so far and plan to add it to my real site here: http://dianebourque.com

I've selected the "PayPal Express - with Single Payments" settings"

When we arrive at the payment PayPal page, there is a 10% Shipping and Handling charge added to the price for the Subscription Plan.

So - my Subscription Plan is 4$ - PLUS a .40c Shipping and Handling charge. Total: 4,40$

HOW DO I GET RID OF THE SHIPPING AND HANDLING CHARGE?

Thanks!

Diane