Can someone please help me with clickwrap agreement technology (pop up to click a box to accept terms and agreements)

Site URL: https://www.tealcanvas.com/

Hi Squarespace pros!

We have a site that will launch within the next week or two.  In our service, we need a pop up that includes our terms of service that a visitor must check a box to agree in order to work with us (a clickwrap). Unfortunately, squarespace does not offer this as a native feature.  Has anyone any experience in this that may be able to help.  We are still password protected.... Tealcanvas0202.

We have been advised that a clickwrap rather than a browsewrap is key to protect us as a business.