Once an offer is made, you can Accept, Decline or Counteroffer. To counteroffer an offer click on counteroffer. After clicking on counteroffer, you will see full details of the deal. Click on the pencil icon against Pricing to edit the pricing. Click Send Counteroffer once pricing is set. The button will be green once the price has been changed. Click on the ‘TON’ or ‘LBS’ to change between the two. 

Finally you can view the new offer.