Is it possible to add code to a form created with automatic tools from WIX

I have a form created automatically and I want to do some manipulations with javascriptcode when the user press the submit button. There is probably some code already generated by Wix on this button. If I activate the developper tools, I can access the clicked button event, and see the code empty but can write something in it. If I do that, what will happen : will it be added to the automatic code or will it override this automatic code?
Claude

Hi, short answer to your question - Yes. You may look up the following article for the how part.

Thank you, i will test it immediatly