Gravity Forms Shortcode Not Working

Have used this plugin before with shortcode from custom contact forms. However, have switched over to Gravity Forms and the shortcode does not seem to work anymore. Here is the link to the page where I am trying to implement the modal form:

http://hoaconnections.com/newsite/live-hoa-website-demo-see-what-the-excitement-is-abouthoa-website-demo/

Any thoughts on how I can correct this issue?

Thank you,
Brian

http://ww.wp.xz.cn/plugins/modal-dialog/