How to make macro to return a value?

Hi guys, I am new in Excel VBA and for the experiment data, I want to find the first number that is bigger than the next one, and i want it to show on a blank cell. How can I achieve this?
The following is the code I wrote

Sub find_yeild_stress()
For i = 19 To 83
If Cells(i, F).Value > Cells(i + 1, F).Value Then
Cells(3, f).Copy.Cells(i, F).Value
End If
Next i
End Sub

Thank you for help!!