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I do not understand how connect multiple pages between them so that user can go back and forward between them. Any guide?

I'm preparing a video tutorial on this, but you just add more pages to the form and they will be processed in the same order, for back button, add a button and enable the "Link behavior"

Video tutorial ready ?
Is there a button that can do : " go to the page " ?

For multi page no unfortunately!
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Yes, any button has the Link behavior which can send you to a different page as a link, you can also use the "Submit page" setting on a submit button to submit the form to a specific page