Try this one (I used a modified version ofNicolas’trailing stop snippet), not tested:

IF Not OnMarket OR (ShortOnMarket AND LongOnMarket[1]) OR (ShortOnMarket[1] AND LongOnMarket) THEN
   StartTrail = 0
   StartPrice = 0
ENDIF
IF c2  and Flag THEN
   EXITSHORT 1 CONTRACT AT MARKET
   Flag       = 0
   //set the flags forthe start of the Trailing Stop
   StartTrail = 1
   StartPrice = tradeprice(1)
ENDIF
//
IF StartTrail THEN
//trailing stop function
trailingstart = 0     //trailing will start @trailinstart points profit
trailingstep  = 5     //trailing step to move the "stoploss"
//reset the stoploss value
IF NOT ONMARKET THEN
 newSL=0
ENDIF
//manage long positions
IF LONGONMARKET THEN
//first move (breakeven)
 IF newSL=0 AND close-StartPrice>=trailingstart*pipsize THEN
  newSL = StartPrice+trailingstep*pipsize
 ENDIF
//next moves
 IF newSL>0 AND close-newSL>=trailingstep*pipsize THEN
  newSL = newSL+trailingstep*pipsize
 ENDIF
ENDIF
//manage short positions
IF SHORTONMARKET THEN
//first move (breakeven)
 IF newSL=0 AND StartPrice-close>=trailingstart*pipsize THEN
  newSL = StartPrice-trailingstep*pipsize
 ENDIF
//next moves
 IF newSL>0 AND newSL-close>=trailingstep*pipsize THEN
  newSL = newSL-trailingstep*pipsize
 ENDIF
ENDIF
//stop order to exit the positions
IF newSL>0 THEN
 SELL AT newSL STOP
 EXITSHORT AT newSL STOP
ENDIF
ENDIF