The only difference from the classic MACD is that this one is calculated with VWMA instead of sma.
Why do I prefer it?
Classic MACD does not include volume. But MACD - VWMA includes volume as well.
How to use it? Whatever you do with MACD, you can do with this. However, if my other indicators meet the conditions, I check MACD - VWMA and if I see that Macd is above the signal, I open the position to buy etc. even if it is below zero. Again, if my other indicators meet the conditions, I use this method.