How to Modify Stop Loss Indices Order on MT4

First choose the open trade you want to modify the Stop Loss Indices Order for.

Once you have selected open trade - select modify order button and following indices trade order window popup will appear and you as the trader can use this trade order window popup to modify 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 new SL stop loss level and Click the 'Modify' button to modify the Stop Loss Indices Order to your open indices trade.

How to Modify Stop Loss Indices Order in MetaTrader 4