Blocking bots

How can I block bots from browsing pages such as who's online, search, new posts, members list..etc that are not needed for SEO ?

You can use robots.txt to block certain pages.

Code:

User-agent: *
Disallow: /attachment.php
Disallow: /newattachment.php
Disallow: /avatar.php
Disallow: /editpost.php
Disallow: /login.php
Disallow: /member.php
Disallow: /member2.php
Disallow: /misc.php
Disallow: /moderator.php
Disallow: /newreply.php
Disallow: /newthread.php
Disallow: /online.php
Disallow: /poll.php
Disallow: /postings.php
Disallow: /printthread.php
Disallow: /private.php
Disallow: /private2.php
Disallow: /report.php
Disallow: /reputation.php
Disallow: /search.php
Disallow: /sendtofriend.php
Disallow: /showgroups.php
Disallow: /showpost.php
Disallow: /threadrate.php
Disallow: /usercp.php
Disallow: /usernote.php
Disallow: /sendmessage.php