Click the link for your administrative theme (such as the core Seven theme), near the top of the page, and verify that there is already a search block for help located in the Help region. If not, follow the steps in the related topic to place the <em>Search form</em> block in the Help region. When configuring the block, choose <em>Help</em> as the search page, and in the <em>Pages</em> tab under <em>Visibility</em>, enter <em>/admin/help</em> to make the search form only visible on the main <em>Help</em> page.