When you have a BitTorrent client you can go ahead and download the universal TBC client torrent here.
Start the download by opening the WoWTBC_2.4.3-universal.torrent file with uTorrent (it should open it with uTorrent automatically).
When your download is complete, go ahead and unrar WoW TBC.rar using, for example: WinRAR
Open up your new WoW TBC folder and:
1) Open up "realmlist.wtf" with Notepad.
2) Delete everything in the realmlist.wtf file (it should already be empty) and paste this in:
set realmlist logon.nextgen-wow.com
3) Save and close the realmlist.wtf file. Make sure you do not accidentally save the file as .txt (realmlist.wtf.txt), it needs to be .wtf only.
4) Start World of Warcraft with Wow.exe.
You should now be able to login with the account you created when you registered for our server (not your forum account) and play the game.