SSL certificate - Not secure warning displaying. Is this a matter of waiting?

Site URL: http://www.studioblanc.co.nz/

I have recently just set up my website and see that when people go to purchase a product it says not secure etc etc as well as having that in the URL so I have made sure all the SSL is right on the website and it still says processing- I am aware it can take up to 72 hours buuuuuut... I transfered the domain that I had already purchased to Squarespace (though nothing was ever set up for this is was just simply a domain to ensure no one else brought it) will this still work or do I need to do some other stuff? 

Hi. It looks like you fixed SSL issue?

On tablet, I see this email on footer doesn't look good.

You can add this to Design > Custom CSS to fix problem

/* Fix footer tablet */
@media screen and (max-width:991px) and (min-width:768px) {
footer.sections .content {
    width: 90% !important;
}
}

and about page

/* Fix about page tablet */
@media screen and (max-width:991px) and (min-width:768px) {
div#block-c8ddcb3ad374f07b8c65 + .row .span-2 {
    width: 100%;
}
}