The Virtual Peace Garden is a project alive in Second Life, not just on this web page. To visit the Virtual Peace Garden in Second Life, you can
1. use this Second Life URL (Slurl): http://slurl.com/secondlife/Teaching%2015/210/150/22 or
2. search for Virtual Peace Garden once in SL.
But in order to do either of those things, you will need to download the Second Life client (a fancy way of saying "software") and you will need to set up a Second Life account / avatar. You will likely also benefit from spending some time on Orientation Island, where you will learn how to move, speak, touch objects, and travel though Second Life.
An excellent set of instructions for getting started can be found here: http://sleducation.wikispaces.com/gettingstarted#about
Once you are active in Second Life, I encourage you to send me (kabbie broadway) a friend request and join our group (The Virtual Peace Garden). You will need to do the latter in order to build on our land. I would be happy to meet you at the VPG and show you around.