running a macro when a cell changes

I am searching for code to run a specific macro when i change the data in a particular cell.
I am already running a Private Sub Worksheet_Change code on the sheet and when i add another, i get errors.

This is what i have now and do not want to remove.

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This is the type of thing found on an internet search which when added to the above code causes a runtime error.
[Range(FindDate) represents the cell i called FindDate which when changed I want to run the Macro called FindSelectedDate]

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How can i achieve this please?

I simply pasted it into VBA. (see below)

I did try adding just the If Not Intersect(Target, Range(FindDate)) Is Nothing Then FindSelectedDate before the End Sub but of course it failed too.

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You are a legend, thank you so much.