Maintaining / updating my website that I built in Google

I bought several domains through Google and used their free tools to build websites. Now the domains are hosted with Squarespace and I don't appear to have any way to update my existing websites. Is there a way for me to keep using and updating those websites I have already built without buying some additional service?

Thanks so much @vicking. I wasn't sure of the answer to your question. As I watched your attached video, I began to suspect I had used Google Sites (not GMB). I used the Google Sites link you embedded and logged in. Presto! my sites were all there and available for my maintenance efforts!