From the Menu bar, Click Order and Trades, Order Book(F3), Make sure Display All Open Box is ed. On Open orders window, the order you want to modify and click the "Pencil icon" on top left corner. or Right click the order and click Modify option(Shift+F2). Modify the rates you want and click Modify Button. Check the Modified rates in Order Book window.
Maitra XTS Software, Modify orders