Private Sub cmdOK_Click()
Application.ScreenUpdating = False
Dim BmkNm As String, NewTxt As String, BmkRng As Range
BmkNm = "DateFiled"
With ActiveDocument
  If .Bookmarks.Exists(BmkNm) Then
    Set BmkRng = .Bookmarks(BmkNm).Range
    BmkRng.Text = Format(dtDateFiled.Value, "MMMM DD, YYYY ")
    .Bookmarks.Add BmkNm, BmkRng
  Else
    MsgBox "Bookmark: " & BmkNm & " not found."
  End If
End With
Set BmkRng = Nothing
Application.ScreenUpdating = True
Unload Me
End Sub