Squarespace: Opening a form as a pop-up or lightbox on a homepage

lease tell me how i can use this feature to open as a pop-up on the homepage only.

Thank you for contacting us.

Do you use a Squarespace or some other platform for your website?

Yes I use square space
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Please kindly follow the next support forum thread:

Squarespace: How to add a popup web form with an X to homepage

If you have any follow up questions, please let us know.

i do i have two questions. one how do i remove the scrolls from the left
side and bottom?
and is there a way to make this responsive? it breaks my homepage on mobile
http://www.empirefastenersllc.com/home-1
thanks
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I saw that you have two other threads where you asked same question. Please see an answers provided by my colleagues on those threads:

https://www.jotform.com/answers/878138-How-do-we-make-lightbox-form-mobile-responsive#1 

https://www.jotform.com/answers/878018-How-do-I-remove-the-scroll-bars-from-this-lightbox#1