ok, first of all
read the forum!! as you will see that the same question has been ask 2 or 3 threads below yours.
http://wow.allakhazam.com/forum.html?forum=69;mid=114913100150255261;num=1;page=1
is the link to this forum.
second of all
read the tradeskill sticky:
Q. How do I unlearn a skill? (Torux)
A. Open your list of skills ('k') and click on the tradeskill you wish to unlearn. At the bottom will be a description of the skill. Next to that is an icon that you can click to unlearn the skill. Be warned, this will completely remove any knowledge you have of that skill, and therefore if you wish to relearn it in the future, you will have to start from the very beginning.
Grtzz
Edited, Thu Jun 1 10:17:48 2006 by ChlKilt
Edited, Thu Jun 1 10:10:42 2006 by ChlKilt