It's the same as regular chess, except the pieces are scrambled in random pattern to start. There are 960 different starting setups, hence the name.
How to play Chess960

Ohhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh! Well that's simpler than I thought!
If it's that simple, teach me how live chess is being won.
How do you play Chess960? I wonder because I still don't have a rating for it.
I'm looking for imformation! If you know how, teach me! THANK YOU!