Protecting a Cell, from input but allow radio button commend to populate the field with the user id and timestamp

I want to protect a cell from editing but allow the cell to be populated with a radio command button that populates the cell with the user id and timestamp.  a pop up message appears when the cell has been populated (in my case approving the form).  I can certainly lock the cell but then the radio button doesn't work,  what do I need to add on the front end of marco below?

Sub Product()

  UserName = Environ("username")
   
    Range("$i$5").Select
    ActiveCell.FormulaR1C1 = UserName
    Range("$j$5").Select
    ActiveCell.FormulaR1C1 = " " & Now

    x = UCase(Range("$i$5").Value)
    y = UCase(Range("$i$3").Value)
   
    If x = y Then

    MsgBox "ERROR - APROVER ID ERROR" & vbNewLine & vbNewLine & "Product Approver ID must be different then Sales Approver ID"
   

    Range("$j5").Select
    ActiveCell = vbNullString
    Range("$i$5").Select
    ActiveCell = vbNullString
   
    Exit Sub
   
    End If

       
    MsgBox "Approved"
End Sub
Carolynne DonohueAsked:
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Rgonzo1971Commented:
Hi,

You could protect your sheet with UserInterfaceOnly = True so that macros still work
for reference
https://msdn.microsoft.com/en-us/library/office/ff840611.aspx

Regards
1

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Rgonzo1971Commented:
A solution
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