How do i make a mac account for my ichat?

I've made like 5 accounts already, but they dont seem to work when I add it in my ichat accounts thing. I might be doing it wrong, please give me step by step instructions on how u make a mac account for ichat. Thanks.|||you have to be a .mac subscriber which is now called mobile me. They give you a 60 day trial then its $100 a year.