A trailing stop loss is a stop that automatically follows price in your favor by a fixed distance. If price moves the right way, the trailing stop moves with it. If price moves against you, the stop stays where it is, so it can lock in gains or limit loss.
How to set it in TradeLocker:
Select the instrument you want to trade from the Instruments/Markets panel.
Open the order panel and enable trailing by clicking the Trail button next to Stop Loss.
Set the trailing distance (T.SL) either by dragging it on the chart or by entering the distance/risk in the order panel (price, ticks, $ amount, or %).
Place the order as Buy or Sell. As the market moves in your favor, the trailing stop moves by your chosen distance; if it reverses, the stop stays put and triggers if hit.