That allows you to drop shortcodes directly into CF7. Second is to add the Accordion in manually with HTML in the contact form, like this:
<!-- begin class .wp-accordion -->
<div class="wp-accordion wpui-light">
<!-- First tab's panel -->
<h3 class="wp-tab-title">Tab 1</h3>
<!-- First tab's contents -->
<div class="wp-tab-content">
All the contents of first tab goes here....
</div><!-- end first tab -->
<!-- Like so, Second panel -->
<h3 class="wp-tab-title">Tab 2</h3>
<div class="wp-tab-content">
Contents of the second tab
</div>
</div><!-- end class wp-accordion -->
I think the second method is preferable, since there is no modifying of core plugin files. I hope this helps out!