Add Custom Field to Page

/** Add Project Information After Content */
add_action ( 'genesis_sidebar', 'mmi_sing_project_side' );
function mmi_sing_project_side() {

  global $wp_query;
	$participants = $wp_query->post->ID;

	echo '<div class="mmi-sidebar">';
	echo '<section class="widget">';
	echo '<h4 class="widgettitle">Participate In This Project</h4>';
	echo get_post_meta($participants, 'participants_needed', true);
	echo '</section>';
	echo '</div>';
	
}