ModalContact is a database based contact form: it does use WP database for storage, instead of mailing form contents.
Activate as any other plugin.
You have 3 options to integrate form into your site:
a) Add the "mcf-link" to your existing contact link:
<a href="/contact" class="mcf-link">Contact</a>
b) Use the "mcf()" function in one of your theme files (
sidebar.php, for example):
<?php if (function_exists('mcf')) : ?> <?php mcf(); ?> <?php endif; ?>
c) If your contact link is generated using
wp_list_pages(), you can enter the contact link title in the MCF Options under "Contact Link Title" and MCF will automatically attempt to add the smcf-link class for that link.