Hello Emilicious,
1. You can see the NPC market function when you select one of the Offers that are always available in the market.
The Market WindowAfter that you can Buy or Sell material in exchange for
Mide Coins 2. When you submit an offer at the Market other players will see your offer in their Market window, if their are close enough within the hourly range you have set for your offer.
For example if you set your offer's hour range to 1 hour, only players who are close to you within one hour time, will see the offer and be able to purchase it.
Enjoy trading,
Your Warmides team.