Reversal trading strategies (switching directly from a long to a short or vice versa on the same bar) are done automatically in NeuroShell when you have no exit conditions, only entry conditions for long and short.
If you wish to have Trailing Stops and/or Exit Conditions combined with a Reversal strategy, then make sure that you select the option “Long/Short entries exit existing short/long position” on the Trading tab of Trading Strategy Parameters screen. Without this option, reversal entries will NOT override trailing stop and/or exit conditions and your strategy will stay in the position until either your trailing stop or exit is filled. However, by selecting this option, your trading strategy will reverse to the opposite position when the reversal entry condition becomes true, even if the current position’s trailing stop and/or exit condition have not been filled.