Back test - Analysis usage

I am testing the backtest function of Analysis. I am using the contract HSI future index January, HSIF4 (IB symbol) in 5 mins period. It is HKD 50 per point. I had fews question about analysis

  1. How to set dollar per point at analysis setting ? it because the default value of profit is not what I expected.
  2. I can see the value of %chg , can I have the value of "chg" ?
  3. what is the meaning of "contracts" and "position value" ?
  4. How to specific set the qty per trade ?

The backtest result

HSIF4 contract detail