How can people go to the next step on my form?

People cannot go further than the first page. 
When they press "NEXT" it doesn´t move forward.

I´ve check if there is anything in the form stopping people, but I couldn´t find anything. 

Hi,

It seems that there is a div element right above the next button (overlaying it), causing this issue.

If you however move it - for example by resizing the window you will be able to click on the next button.

This seems to work correctly if we add this CSS code:

#checkSubmission {
    padding-top: 0 !important;
}

You can see here how to Inject Custom CSS Codes.

Do let us know in case you have any further issues with it.

Best Regards,
Ben

Thank you Ben. This really helped. 

Hi,

You are welcome, I am glad that it helped you.

Do let us know if you have any further questions.

Best Regards,
Ben