Hightlight the hyperlink in the normal view
Switch to the HTML view, and locate the <a href.....tag to the left of the word or words you selected
Place the following between the "a" and the "href":
style="text-decoration: none."
For example: a link to the FrontPage web site would appear in HTML view as :
<a style="text-decoration: none" href="http://www.microsoft.com/frontpage">