Create accept checkbox on a form and pop up with conditions

Hello people,
Im creating a form for subscribers but must have have a checkbox accepting the conditions for data protection law that the people must mark to activate the subscribe button.
Also i need to make a button to show these conditions on a pop up frame.

Im a bit lost with this… on the website you can see as far as i have gone

Thanks


Here is my public share link: www.whitestaribiza.com