Need vba code to get pop up message.

My name is Laxmikant V NaiK and I have just joined the forum. I need help in a VBA code.Attached is the file and the code I have written.Its for the Stock market
The worksheet name is WorkArea
Here I have a Buy Column(H) and sell column(I).The price in column F keeps changing.So when the price in column F equals price in column H or I then I get a pop up message.I get that pop up message.Issue is that I need to keep pressing the run button for the pop up message to come.I need a code that runs it automatically whenever the condition is met.
Thanks & Regards
Laxmikant v Naik

SpotCalData.xls223 KB