Or, if you have big hands, you can just do it the way Hendrix made his cords. Use your thumb to cover the two lower strings and position your other fingers as Jarviss told you. Either way, if you practice enough, your hands will soon find the position that's most comfortable for them. Just make sure none of your strings are muted! It's really hard to play a chord a new way once you've learned it. So make sure you get it right the first time.