If you already have an account then simply login to HELM and go to Packages -> add new and choose one of the new Railo Plans. Please note that the SETUP fee still applies for all new packages, but is still a one-time fee for fraud validation purposes and your hosting is then FREE forever. For more info please refer to the HELP pages.
If you do not yet have an account then simply SIGNUP from the hosting page.
Please don't forget to check the Hosting support pages if you get stuck, most common questions can be found there.