You can set a Trailing Stop Loss both when placing an order and after opening a position.

To set a Trailing Stop Loss while placing an order, check the Stop Loss field. After expanding the window, set the desired Stop Loss value, which will then enable the option to edit the Trailing Stop field. Enter the preferred value and proceed with placing the order.

To enable a trailing Stop Loss from an open position, right-click on the open position in the "Terminal" window and select the "Modify" option, or click the "+" button in the SL column and then modify the position.