Too many indexed pages on my blog

I have a wordpress blog into a subdirectory, like www.mysite.com/myblog/index.php.

The problem is that Google is indexing too many pages from that blog, even rss feed, even it's is not recognized format.

How can I have only my index page indexed, not everything?
I know it's on robots.txt, but I have a lot on files and subdirectories there. So, what is to be dissalowed, and what not?

Thanks!

Disallow every directory below /myblog/ and every page in /myblog/ except your index page. The other option is to add <meta name="robots" content="nofollow,noindex"> to every page accept your index. This is pretty easy by editing the template that generates your head tags. I haven't played much with Wordpress, but there is probably a single PHP file generating the head and everything in it for all pages. put some PHP in that to create the meta tag above in all cases except on the index page.