A Trailing stop can be created and submitted using the following steps:
1) In the order entry window, select "Trailing stop" from the drop-down menu ("Other").
2) Select the price trigger price method for the "Stop" and "callback rate" values. For this select either the mark, last or index price as the applicable trigger price method.
DISCLAIMER: Please note that the selected trigger price method can significantly affect the timing of when your order is triggered.
3) Insert the preferred stop loss price ("Stop"), Callback rate ("Callback rate") and size. Select the preferred time in force function ("GTC" or "IOC"), Attributes ("Post-Only" and/or "Reduce-Only") and lastly the direction (Buy or Sell).