gistfile1.php

<?php
add_filter( 'cac/settings/tabs', 'myplugin_cac_settings_tabs' );

/**
 * Add the tab
 */
function myplugin_cac_settings_tabs( $tabs ) {
	// Add a tab to the list of Admin Columns settings tabs
	$tabs['myplugin-information'] = __( 'Am I a wizard?', 'myplugin_textdomain' );
	
	return $tabs;
}

// Applies to myplugin-information tab only
// Use the general filter "cac/settings/tab_contents" filter to filter all custom tabs (tab ID is passed as second parameter)
add_filter( 'cac/settings/tab_contents/tab=myplugin-information', 'myplugin_cac_settings_tab_contents' );

/**
 * Change the content of this tab
 */
function myplugin_cac_settings_tab_contents( $contents ) {
	$user = wp_get_current_user();

	// Determine with 92% accuracy whether the current user is a wizard, and display a message accordingly
	if ( get_user_meta( $user->ID, 'first_name', true ) == 'Harry' ) {
		$contents = __( 'You&#39;re a wizard, Harry.', 'myplugin_textdomain' );
	}
	else {
		$contents = __( 'Nope.', 'myplugin_textdomain' );
	}

	return $contents;
}
?>