How to Add Stop Loss Indices Order on MT4

First choose the open trade you want to add a Stop Loss Indices Order to.

Once you have selected open trade - choose modify order button & the following trade order window pop up will appear & you as a trader can use this trade order window pop up to add the Stop Loss Indices Order Level for your new trade.

This pop up includes the settings for setting Stop Loss Indices Order Level - type in your SL stop loss level and Click "Modify" button key to add the Stop Loss Indices Order to your open trade.

How to Add Stop Loss Indices Order in Meta Trader 4