I try to answer all email inquiries promptly, and there are several ways to get help online as well.
Email support is free and unlimited. Please see the Contact page for details.
There is a Google mailing list for Felix users. You can browse emails to the list online, or join and post your own questions.
There is now a forum for Felix users. You can use it to ask questions about and discuss Felix and the various free tools that come with Felix. The forum is still relatively new, but I monitor it regularly.