Firstly, try a post title that has something descriptive to do with your question. "Help" simply doesn't tell anyone anything - everyone here needs help. Secondly, if you'd *actually* tried the command posted by repo above, you would have had all the information you needed to solve your problem. "man <command>" gives you all the documentation you would have needed to solve your problem. Try putting a little effort in next time, eh?
Anyway, here is your answer. Even if I didn't know it, it would have taken around twenty seconds to find out even if I'd just typed "chkconfig" into Google. Hey-ho.
chkconfig --level 23 bigd on
EDIT: Oh, I see from your post history you're simply posting your homework questions. Well, fine...consider this one a freebie. Hope you're not expecting to go to college buddy.