easiest form generator

Formoid is a free desktop app that helps you easily create signup forms, surveys, order forms, event registrations and more in a few seconds without writing a single line of code. Create beautiful online forms in just a few clicks.

I can not find the option for preview contact form with captcha

Dear Support team,
I am a university teacher in the department of film, television and multimedia production.
I have down loaded your program “Formoid” which is a free version.
I am trying to understand how to use it. I can not find the option for preview in the tool bar before uploading onto the server. May I please get your help? Thanking you in anticipation of your reply.
Sincerely yours,