It depends on each topic that you would like to use.
For Twenty Twelve you need to set the front page (static page) and give it a name.
then you copy the .php functions to the child themes folder, and then find this:
function twentytwelve_page_menu_args( $args ) { if ( ! isset( $args['show_home'] ) ) $args['show_home'] = true; return $args; } add_filter( 'wp_page_menu_args', 'twentytwelve_page_menu_args' );
and change this single line:
$args['show_home'] = false;
Alternatively, a simple solution is to go to the "Menu" tab on the left and play with the menu options there, you can add your own if you want.
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