Can I modify my order after the order has been submitted?

he seller has not yet delivered items:

We will negotiate with seller to modify.

The seller has delivered items:

We cannot negotiate with seller to modify at this stage. If you adhere to replace, you can request returns service after items have arrived to our warehouse, and then resubmit the order to buy your modified options, but delivery fee caused in returning your previous items would need to be paid by you.