Repeatedly click a cmdButton to populate a TextBox with different cell values

Hi I'm new here
First post. Thanks for reading it.

I'm trying to achieve the following but I'm stumped;
Each time the user clicks the cmdButton, the value of the next cell in the column is displayed in the TextBox.
(The user will eventually come across a value in the TextBox that he or she is looking for and select it)

Here is my non-working novice code;

Dim DriverName As String
Dim i As Integer
Dim c As Integer
Dim ws As Worksheet
Set ws = Worksheets("Incomplete")

i = 0

Do
   i = i + 1
                If ws.Cells(i, 2).Value <> "" Then
                              c = c + 1
                End If

Loop Until ws.Cells(i, 2) = ""

For i = 2 To c

             DriverName = ws.Cells(i, 4).Value

Next i

txtShowDriverName.Value = DriverName