How to unsubscribe user requested product

Hi All,

            From End user web application a user requested a product (Service Item), once approval process completes, system will assign the product to the user.  Now user can unsubscribe the product from Web interface.  But my question is, How Administrator can remove that product from user?  I have accessed Manager (viadmin) but i didn't see any option to remove Entitlements.

thanks

Rob