To modify a Trailing Stop:
–    Right Click on the open order
–    Choose ‘Trailing Stop’ 
–    Select the number of Ticks you want to change from the list or click on ‘Custom’ and specify preferred value.

To remove a Trailing Stop:    
–    Right-clink on the open order
–    Choose ‘Trailing Stop’ 
–    Select ‘None’
The ‘Delete All’ button will remove the Trailing Stops of all your positions and pending orders.