I am trying to get on the world of warcraft public test realm, and i click on it from the launcher and it takes me to the world of warcraft ptr page and i have downloaded the client for it and everything so after that i went and clicked on it again and it took me to the page again... how do i get on to play on it??!

first you download the file named WoW-3.0.1.8874-PTR-US-Installer-downloader. then you double click it and download it. the new file will be a folder called 3.0.1.8874 US PTR Installer. open the folder inside the folder there will be a file called Blizzard Updater click the one with the shooting star icon not the folder one. if you have vista it will ask you wether or not to continue and then a box will open that asks you where you want to save it just click ok and itll do its magic then all you have to do is open public test realm and it should work i think it will do another update once you sign in but its automatic.

Open the PTR from where you saved it. It's a seperate Client.

The correct method for installing and booting the PTR is very fiddly, but you can find a complete guide here: http://www.wowwiki.com/Getting_on_the_Test_Realm