To add/modify stop loss or profit target:
Click on the Trade tab at the bottom left are of the MT4 platform. There, you will find all of your trades, including their entry prices, position sizes, stop losses, and profit targets.
Right-click on the trade that you want to modify and select the “Modify or Delete Order” option.
Next, fill in the Stop Loss and Take Profit fields with your desired levels. When you’re done, hit the Modify button.
A dialogue box should appear to confirm that your trade adjustments have been executed.