Dropdown menu not working

Most importantly link to a page with the issue

What is your website?

If you’re not using a Child Theme, and if the theme doesn’t have a designated section of the dashboard for CSS modifications then install this Custom CSS Manager plugin http://wordpress.org/plugins/custom-css-manager-plugin

Then use its “CSS Code” section of the dashboard to hold your CSS modifications:

Alternatively use your Child Theme style.css file to hold your CSS modifications:

.navbar {
    overflow: visible;
}

.navbar li:hover .dropdown-menu {
    display: block;
}