Comment on Technical Support by SEO Dave.

WordPress Technical Support Have you tried the WordPress Support Forums at there’s thousands of people there with expertise in various areas of WordPress who will help you with general and specific WordPress support issues for free.

It’s one of the sites I use for support when stuck on a problem as you can see from my profile

Look for a plugin to achieve what you want. For the record the website you linked to isn’t a WordPress site, so they aren’t using a WordPress way to achieve what you want to do: no idea if the feature exists via a WP plugin.