Pro forms for free membership

I have pro forms but I don’t want to charge users to become a registered member. I want simply the free membership option

You can find free form shortcodes in the same place as those requiring payment.

Did you ever solve this problem? I found the free form and set it up. The form works, but the submit form button does nothing. No account creation, no welcome email. Anyone with suggestions? Please detail your answer as if I know nothing. I know nothing and need step by steps.