In EdgeProX if you have already placed an order without brackets whether that is limit or market order. There is a way to add your OCO brackets afterwards. 

To add on the brackets, first click on the 'Power' button to turn on the brackets (image below). 

Then select your preferred OCO (bracket) using the dropdown (image below). To see how to configure bracket orders and exit strategies please see the attached link. EdgeProX Futures Trading Platform Video Tutorials | Edge Clear

Then click on the 'Attach Clip' icon next to the power button to add your OCO brackets to an already executed order (image below). 

This can be done via the DOM panel or the Order Ticket Panel. Please see the image below for clarity.