Checkbox Adding Value To a Textbox

Have a userform with a checkbox and whenever i check it off, the value of a textbox goes from 19 to zero.

I created another textbox48 and I want to place an 'F' in it whenever that same checkbox is checked off. below is the code

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Private Sub cbxna40_Click()
If cbxna40 Then
txtpossible40.Value = 0
txtscore40.Value = 0
Else

txtpossible40.Value = 19
txtscore40.Value = 19

End If
End Sub

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thanks, taht worked. thought i did place tags? next time for sure