Customize the default search text and search form using the Genesis Framework.

functions.php

<?php
//* Customize Search Text
add_filter( 'genesis_search_text', 'amn_search_text');
function amn_search_text() {
	return esc_attr__( 'Search this website...', 'genesis' );
}

//* Customize Search Form
add_filter( 'genesis_search_form', 'amn_search_form', 10, 4);
function amn_search_form( $form, $search_text, $button_text, $label ) {
$onfocus = " onfocus=\"if (this.value == '$search_text') {this.value = '';}\"";
$onblur = " onblur=\"if (this.value == '') {this.value = '$search_text';}\"";
$form = '
<form method="get" class="searchform search-form" action="' . home_url() . '/search/" >
' . $label . '
<input type="text" value="' . esc_attr( $search_text ) . '" name="q" class="s search-input"' . $onfocus . $onblur . ' />
<input type="submit" class="searchsubmit search-submit" value="' . esc_attr( $button_text ) . '" />
</form>
';
return $form;
}