but i need to change permalink. i need to remove buddyblog and change in to posts.

@maan18 http://buddydev.com/buddypress/introducing-buddyblog-allow-users-to-blog-from-their-buddypress-profile/#comment-316231

Your code is outputting the exact same line of code to both logged in users and logged out users:

do_action( 'bp_member_header_actions' );

The idea of an ‘if’ statement is to output different code based on certain criteria being met.

it should work, I have used this approach many times.

I’m not sure what you’re asking exactly but take a look at this:
<?php
if ( is_user_logged_in() ) {
// whatever you put here will be displayed if the user is logged in
} else {
// whatever you put here will be displayed when logged out
}
?>