Including categories in main header nav

I’m on WP 2.9.2 with the BuddyPress 1.2.3 plugin.
Anyone know how to include categories in the main header nav?
My site url is https://www.restaurant-diaries.com/
I’d like to have the 4 categories in the sidebar appear in the main nav.

This is how the code looks right now with some pages excluded.

<?php wp_list_pages( ‘title_li=&depth=1&exclude=143,9,109,29’ . bp_dtheme_page_on_front() ); ?>

Any advice appreciated.

h2o