Range("A & i &") should be Range("A" & i)
Also, I think you need to know how the arguments for CalculateScore are
declared, strings or ranges? (and possibly variants - but the actual code in
CalculateScore should show how the arguments s/b passed).
If declared as a range, I think you'll need to use
For i = 14 to 33
Range("A" & i).Value = CalculateScore(Range("B" & i), Range("C" & i),
Range("D" & i))
Next i
If the arguments are declared as a string, then just
For i = 14 to 33
Range("A" & i).Value = CalculateScore("B" & i, "C" & i, "D" & i)
Next i
If the OP actually wants the formula in the cell then
For i = 14 to 33
Range("A" & i).Formula = "=CalculateScore(B" & i & ", C" & i & ", D" & i &
")"
Next i