How to Add Stop Loss Indices Order on MT4
First select the open trade that you want to add a Stop Loss Indices Order to.
Once you select the open trade - select the modify order button and the following indices trade order popup window will appear and as a indices trader you can use this trade order popup window to add the Stop Loss Indices Order Level for your new indices trade.
This popup includes the settings for setting Stop Loss Indices Order Level - type in your SL stop loss level and Click the "Modify" button to add the Stop Loss Indices Order to your open indices trade.
How to Add Stop Loss Indices Order on MT4