Instagram and Facebook shop

I am trying to connect my website to an Instagram and Facebook shop but in the Facebook Commerce manager when I select ‘Connect a Partner platform’ there is no Squarespace option, just Shopify, Big Commerce etc. How can I connect my website to a Facebook and Instagam shop? Thank you.

I could also use some assistance in this area, I follow all directions and still can not seem to get this worked out. So frustrating. Should not be this difficult.