Hiya Bryan,
If your still struggling post an example and I'd be glad to help, I learnt from the master DRJ.
TButhe is spot on however I find basic names helpful so here you are.
[VBA]
Private Sub CommandButton1_Click()
Selection.GoTo What:=wdGoToBookmark, Name:="Bookmark1"
Selection.Range.Text = Me.TextBox1.Text
Unload Me
End Sub
[/VBA]