An order you have placed that has not been completed yet. So you can cancel your open orders under the "open orders” section below the Buy/Sell Window, and review your successful orders under the “Orders” Section.
Orders that have been succeeded already.
An order you have placed that has not been completed yet or you have a withdrawal, the same amount of assets will be reserved for withdrawal or order completion. To free your reserved assets just cancel the orders below the “Open Orders” or cancel your pending withdrawal.