Multi-Step doesn’t work

Hi!
I created a multi step form (3 forms), and 3 pages.
On page 1, when I fill field and after click next, nothing happens.
Can you please advise me what is the problem?
Thank you in advance for your help.

I use a Rookie template.

I followed the instructions on:
https://webheadcoder.com/contact-form-7-multi-step-form/

My web (example multi step form):
https://futsalhavirov.cz/nazev-klubu/

The page I need help with: [log in to see the link]