Using the Webtrader > Advanced tab, Stop Loss and Profit Target orders can be attached initially only.
If you already have an open position, you can place a "StopLoss" or "Profit Target" order anytime using the method below:
If Position is Long:
Create SL: Place a new Sell Stop order BELOW the price.
Create PT: Place a new Sell Limit order ABOVE the price.
If Position is Short:
Create SL: Place a new Buy Stop order ABOVE the price.
Create PT: Place a new Buy Limit order BELOW the price.