What is GTC and how can I enable it?

Good ’til canceled (GTC) is a type of order in which an investor can buy or sell a security that stays active until either the order is filled or the investor cancels it. To enable this the user must select GTC as an option when placing a limit order, stop order or market-if-touched order.

Please note that a GTC order is only valid for 90 days unless cancelled.