I need just a little bit more tc so I decided to sell my orc force, but I don't know how to sell on the market.

Go to the Shop, then go to your activated or deactivated inventory (I don't know where is your item), then click on the item image, set the price that you want to sell your item, then click on Update, and WOOW, it will be on market, then wait someone buy your item. gg

Thanks if someone buys my kron force(I said orc force on accident)ill probably be able to get the custom belt almost.

You can only purchase a custom belt item when you have 20000 qi (custom belt) though.