Firstly use conditional formatting, so use a formula in conditional formatting to say
then you can use the fill in the conditional formatting options to fill it red, you can then drag this down to the end of your column as long as you don't lock in the cell i.e $P$5
For counting, there may be an easier way, but I would put a helper cell and use
This will return how many times "Test" appears, from this answer you can then run a message box to display how many times it appears using the following, for example if your helper cell is Q1
To then run this crate a command button in excel under the developer tab, and place the code above in the command button, when you click the button the message box will display
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