Howdy Jounghan,
You can definitely move that form. I am not super familiar with Avada but perhaps our tutorial here will still help you move it: Moving the Eventbrite Tickets box The instructions there in might still work for Avada, depending on how Avada is designed. If that does not work though you should reach out to the fine folks at Avada. They have intimate knowledge of how their templates are designed, actually have a copy of the theme, and have informed us they are happy to help with these sorts of questions.
Does that all make sense? Will that work for you? Please let me know.
Cheers!
– Brook