There are two options: pro pricing and free signup. Signing up is as simple as possible. You just need to create a username and password. Once you get in and start using their tools, you’ll have to upgrade. The free account limits the number of forms you can use. When you hit that limit, you’re requested to upgrade. Otherwise your account won’t work.
The first helps direct attention to the goal of the page -- for you to fill out the form -- in a way that's unobtrusive and feels less like a chore. The second gives this page an SEO boost (search engines will have more content to crawl) and assuages any worry from folks who need to know more about a piece of content before handing over their information, all while not distracting people from the chat window.