WordPress MU

Hello, sorry my bad enlgish.

When new user registrations, and create a new blog, they role is Administrator, but I'm want his role is Author.
They stand administrator and can change turn off plugins e.t.c and this is poor. How it's change?

Thanks

Search the forum before posting.

http://www.google.com/search?hl=uk&sitesearch=mu.wordpress.org&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=default+role&spell=1

thanks!