It is better to use the existing thread, but it's not very often that Nintendo WFC matches are successfully set up on the boards in the first place. So good luck.
click here if you want to post your friends code there. wait till someone post there's. so then I'll just check back and see if that person wants to add you. so then go to his profile and ask him if he wants to play. Make sure he added you. Also make sure you give him the code. then when you are ready. go on ahead and have fun playing.