You did not specify where you want the High and Low. I used High on the Buy orders and Low on the Sell orders. If this is not what you want let me know.
There are 2 available options that you can set.
First one is you can set which bar from open you want the trailing to start on.
Comment1 = "Start trailing on which bar after order opened?";
BarsFromOpen = 0;
Second one is you can see set it to use any previous bars' High/Low
Comment2 = "Use which bars' Hi/Lo?";
WhichBar = 1;