One of the example systems in the PRT manual uses simple 2 bar breakout by setting the high and low of the first two bars of a trading day. How would I change that to using the first 4 bars from the given start time? Any help would be greatly appreciated as my programming skills are still very basic!

The relevant part of the code from their manual is as follows (itf is attached):

DEFPARAM PreLoadBars = 0
// The position is closed at 9:45 p.m., local market time (France).
DEFPARAM FlatAfter = 234500
// No new position is taken after the candlestick that closes 5:15 p.m.
LimitEntryTime = 201500
// The market analysis strats at the 15-minute candlestick which closes at 9:30 a.m.
StartTime = 133000
// Some holidays such as the 24th and 31st of December are excluded
IF (Month = 5 AND Day = 1) OR (Month = 12 AND (Day = 24 OR Day = 25 OR Day = 26 OR Day = 30 OR Day =31)) THEN
TradingDay = 0
ELSE
TradingDay = 1
ENDIF
// Variables which can be adapted based on your preferences
PositionSize = 1
AmplitudeMax = 58
AmplitudeMin = 11
OrderDistance = 4
MinPercent = 30
// We initialize this variable once at the beginning of the trading system.
ONCE StartTradingDay = -1
// The variables which can change during the day are initialized
// at the beginning of each new trading day.
IF (Time <= StartTime AND StartTradingDay <> 0) OR IntradayBarIndex = 0 THEN
BuyLevel = 0
SellLevel = 0
BuyPosition = 0
SellPosition = 0
StartTradingDay = 0
ELSIF Time >= StartTime AND StartTradingDay = 0 AND TradingDay = 1 THEN
// We store the index of the first bar of the trading day
IndexStartDay = IntradayBarIndex
StartTradingDay = 1
ELSIF StartTradingDay = 1 AND Time <= LimitEntryTime THEN
// For each trading day, the highest and lowest price of the instrument
// are recorded every 15 minutes since StartTime
// until the buy and sell levels can be defined
IF BuyLevel = 0 OR SellLevel = 0 THEN
UpperLevel = Highest[IntradayBarIndex - IndexStartDay + 1](High)
LowerLevel = Lowest [IntradayBarIndex - IndexStartDay + 1](Low)
// Calculation of the difference between the highest
// and lowest price of the instrument since StartTime
DayDistance = UpperLevel - LowerLevel
// Calculation of the minimum distance between the upper level and lower level
// to consider a breakout of the upper or lower level to be significant
MinDistance = DayDistance * MinPercent / 100
// Calculation of the buy and sell levels for the day if the conditions are met
IF DayDistance <= AmplitudeMax THEN
IF SellLevel = 0 AND (Close - LowerLevel) >= MinDistance THEN
SellLevel = LowerLevel + OrderDistance
ENDIF
IF BuyLevel = 0 AND (UpperLevel - Close) >= MinDistance THEN
BuyLevel = UpperLevel - OrderDistance
ENDIF
ENDIF
ENDIF
// Creation of buy and sell short orders for the day if the conditions are met
IF SellLevel > 0 AND BuyLevel > 0 AND (BuyLevel - SellLevel) >= AmplitudeMin THEN
IF BuyPosition = 0 THEN
IF LongOnMarket THEN
BuyPosition = 1
ELSE
BUY PositionSize CONTRACT AT BuyLevel STOP
ENDIF
ENDIF
IF SellPosition = 0 THEN
IF ShortOnMarket THEN
SellPosition = 1
ELSE
SELLSHORT PositionSize CONTRACT AT SellLevel STOP
ENDIF
ENDIF
ENDIF
ENDIF