This guide will let you know how to use the Trading Post in Farthest Frontier.
If a trader comes to your trading post and says “hi” then you have to be ready for it. And you have to find the items that you are willing to sell.
Now, let’s say if you want to sell the shirts, then you need to click on them and slide them over. They’ll bring the number of shirts over there to be sold.
Another thing you need to do is make sure you transfer lots of gold to your trading post if you’re interested in buying. You have to click on transfer gold, slide, and put gold back into your gold storage. You can also put it all into your trading post.
Now the trader is here and you can see all the things that you buy from him.
To purchase some shirts, you have to click on them and slide for how many shirts you want to buy. It will tell you how much gold it’s going to cost. Then you have to select “buy in stock” or “buy” and transfer. You can put it in the storage or you can leave it at the trading post.
As far as the question for selling, just click under the Buy tab next to the item you want to buy, and then it would be the opposite . 
You will need to drag it this way, it’ll ask you how much you want to sell and you have to click on Sell.
It will show you how much money you’re going to get for it.