Google is your friend. This question has been asked and answered countless times, and there are probably hundreds of websites out there detailing exactly how to perform this task. So rather than repeat what has already been done, I'll tell you to hit Google (or your search engine of choice) to find the answer yourself.

And for the future, probably at least 9 out of every 10 problems you have will have been encountered by someone else previously. Odds are at least one of them put up a web page about it.