How can I make my forms send using a secure method (HTTPS)

Title explains it all.  Some of our forms take payment information so they should have some sort of encryption.  How can we do that for those forms? 

All of our forms are secure now by default, you can read about it on this link:

http://www.jotform.com/blog/175-All-Forms-are-Now-Secure-by-Default-The-SSL-Limits-on-Free-Accounts-are-Lifted-

However, if you want, you can encrypt your forms, you will find the steps to do it on this guide:

http://www.jotform.com/help/344-What-are-Encrypted-Forms-and-how-to-use-them-as-expert

Hope this helps.