my_search_form function( $form ) {
$form = '
<form role="search" method="get" id="searchform" action="' . home_url( '/' ) . '">
<label class="screen-reader-text" for="s">search:</label>
<input type="text" value="' . get_search_query() . '" name="s" id="s">
<input type="submit" id="searchsubmit" value="Find">
</form>';
return $form;
}
add_filter( 'get_search_form', 'my_search_form' );