As for as the Default Buddypress theme is concerned, when activated the theme only shows the navigation to its main components such as Home, Activity, Members and Groups.It will not show you, other than that four pages.

But we always create many pages such as About and contact, which we believe very important enough to show them in the main navigation along with the default four links.

To show the Top level pages to the Main navigation,

1. Go to Appearance -> Editor in WordPress Administration Panel.

2. Select the Buddypress theme.

3. Open Functions.php in that theme.

4. Add the Following Code at the bottom.

/* Adding Top Level Pages to Default Buddypress Navigation */
function bp_sparun_add_nav(){
do_action(‘bp_sparun_add_nav’);
wp_list_pages(array(‘depth’=>1,’title_li’=>”));
}
add_action(‘bp_nav_items’,'bp_sparun_add_nav’);

5. Save Changes.

Now the top level pages can be seen in the navigation.In the above code, you can change all occurances of “sparun“.But it should be unique.