“Counter” allows you to change the offer, whether it’s the shoes and/or the cash involved.
Use the ‘Counter’ button to tweak an offer rather than straight up declining it. Would $25 in extra cash convince you to accept the trade? Then counter it. Do they want a size 12 but you have an 11.5? Counter it! What about another shoe? You never know until you try.
Your counteroffer won’t be sent until you confirm the new offer by selecting “Send Offer”.