How we can backtest the strategy created in algostra. The strategy entry and exit rule is based on Nifty future chart and taking entry on option spread.

How to write in system buider for the following condition:
Bullish trade-

1. Green candle close above VWAP.
2. Then LTP crosses previous candle high+2 points

Bearish trade-

1. Red candle close below VWAP.
2. Then LTP crosses below previous candle low-2 points

Also can we use VWAP in nifty spot chart.