Hi Stan,
You can select Font from the Format menu, or if you select Customize from
the Tools menu and then go to the Commands tab and select the Format
Category, you will find buttons for superscript and subscript that you can
click on and drag onto the toolbar to facilitate the operation.
Please post any further questions or followup to the newsgroups for the
benefit of others who may be interested. Unsolicited questions forwarded
directly to me will only be answered on a paid consulting basis.
Hope this helps
Doug Robbins - Word MVP