How to hide wordpress page?

According to the template tag, wp_list_pages(), you would use the exclude=argument:

<?php wp_list_pages ('exclude=10&depth=1&orderby=name&order=ASC&title_li='); ?>

Note: delete hide_empty as that’s not a valid argument with wp_list_pages.

thank you!

where is this php code is located?
i also need to hide a page.

where is this php code is located?
i also need to hide a page.

My particular code was in my header.php