Shipping charges are charged to the delivery company (in this case, QXpress) and not to us. We have no control over either the inclusion or waiver of that amount.
For convenience, Qoo10 has merged both the delivery charge as well as the cost of our product together. We, as sellers, are not able to decouple those figures either.
If you wish to add additional purchases to your order, you can only do so if your order has not been delivered. After your order has been delivered, it is deemed to have been fulfilled and completed, and we won't be able to make any other additions.
Hope this helps!