Getting stuck with redirects

I've purchased from Squarespace the domain gravitationalshift.com. For simplicity and cost, I've used a google site to create a very basic web page. I've attempted to add the appropriate CNAME records and update A records to the DNS so that gravitationalshift.com is pointing at the google site, while also adding a custom URL within the Google Admin Console.  A search for www.gravitationalshift.com shows me the google site and displays the URL gravitationalshift.com.  However gravitationalshift.com gives a 404 error.  I've been trying to work out what I need to do but am struggling. I think I need to add a redirect from gravitationalshift.com, but I can't figure out how to do this.  Any advice folks?