Trading
Once you build a Trading Post, Traders will visit you periodically. You can barter with them by selecting their goods and offering some of your resources in return. The bar beneath the selected goods will show you if the Trader is happy with your proposal, and once the bar turns green, you can press the "trade" button to confirm the transaction.
When there's no Trader in town, you can select the Trading Post and find out when the next one arrives. Arriving Traders can be called immediately at the cost of 0.5 Queen's Impatience. The Impatience cost doubles with every subsequent trader call.
Traders can be attacked by pressing the sword icon in the Trade Panel. This will take half of its inventory but kill 2-4 villagers, raise Queen's Impatience by 2 and increase the trader arrival time by 50%.