I’m required to create a user form like the one in the picture

I need to open a file with an extension of .txt from excel using VBA and also the button provided.
After selecting the file, when i press start it will open the file.
I was given some codes done by previously but was not working.
will appreciate if someone can help me with this. Thanks!
Public Sub CommandButton1_Click()
Unload Me 'Cancellation command
End Sub
Private Sub CommandButton2_Click()
'start button
Application.ScreenUpdating = False
Sheets("Summary").Select
Call Transposer("Summary Transpose")
Sheets("Failing Patterns").Select
Call Transposer("Failing Patterns Transpose")
Me.Status = "Status: Finished"
Me.Error = ""
'Make sure the screen updates before the end
Application.ScreenUpdating = True
End Sub
Public Sub Label1_Click()
End Sub
Private Sub testFinder_Click()
Me.testDirectory.Value = Application.GetOpenFilename
End Sub
Public Sub UserForm_Click()
End Sub
To Select the Text File Put this code in the testFinder_Click()
To open the text file you can use this code.