Next time please ask in the appropriate forum:
1) Go to Castle, Build a Marketplace. Then, go to the Market, click "Post a lot", select Your ore, enter the amount you want to sell, the price and the duration.
2) Got to a facility that requires Ore and has the gold to pay for them. Enter the facility and enter the amount you want to sell in the "Purchase" section of the "Required for production per unit" table. Click ">>" to sell |