Hello,
I can help you to change your DNS setting on your SquareSpace and configure cName records with provide a fully working environment.
I have 15 years of experience in Web Hosting, Server Administration & Securities, Technical Support, WHM-Cpanel, CentOS Web Panel, VestaCP, AWS, Azure, Cloud, and Email marketing servers, and their all services without any issues.
Let's start a chat session for further discussion about your task, then I'll start it now.
Thank You.