The third eye can be opened in a number of ways. But meditation is usually the best.
Rather than try to retype everything, here's a link to a post I made in this forum.
http://www.spiritualforums.com/vb/sh...d.php?t=110280
If you don't know much about the third eye (the pineal gland), you'll likely want to do some reading on that too. Google will give you a nice variety of answers, and you can experiment a bit to find a truth that works for you.