volume indicator

I found a no demand no supply indicator it works good the problem is that it doesn't give alerts. Can someone code alerts for me and if possible it to show arrows

Is there anybody that can help with this? Intention To come up with a volume indicator that can show if volume pressure is bullish or bearish in nature and to show the difference (in bullishness/bearishness) over time. I understand that volume is tick volume, but all the same it shows activity...