Hello Increasenow,
All depends on which order entry you use with the GST software, if you trade off the trading pad at the top you will notice "none" button select that option and additional window will pop open, at the top of that window you will see "none" again click on that and you will see a list of exit styles available. From there select the one you wish to use set the parameters and hit close at the bottom of the window. You should be set to go, if you need assistance directly from my technical staff we can walk you through it.
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