1. Click the backpack icon
2. Click the "Set a stall" Icon
3. A window will then pop up.
4. Drag the item you want to sell to the window and set a price for your items, and enter how many you want to sell.
5. Then, this information will be displayed in the window.
6. If you don't want to sell the items anymore, choose "Delete Vended item"
7. Write an advertisement for your Items.
8. Choose "Set a stall"