using brand-crowd content for the look of my site

I use brandcrowd for my logos, etc and would like to do that for my website.  They offer for no additional charge to create page appearance in my logo style for my website but i need to change domain settings.  I am such a novice that I don't know first if that will mess up my ecommerce with squarespace and secondly, I don't know how to change the domain settings.  This is the area they suggest I change.

I would appreciate any help you can give.