It's a trick I learned from somebody else in this forum.
You take the address of the web site, for instance
http://www.onstagemedia.com/mudcat
and wrap it up as follows:
!a href=......?Digitrad!/a?
but instead of typing ! you type <
instead of typing ? you type >
and you replace the ....... with the address. The word Digitrad will then be highlighted.
The end result is you create an HTML tag which your browser recognises - it does the underlining and highlighting.
HTH
Rick