Hi there, @JuliaH! 👋
Welcome to the Seller Community! We are so happy to have you here. 😊
In order to use a custom domain with your Square Online website, you have to be on a paid plan.
However, you can edit your Square subdomain too, if you do not like how the current one looks. It will just always have the .square.site behind it as a free subdomain.
You can check out this Support Article for how to upgrade your Square Online plan, if you choose to do so and you can check out this Support Article for getting started with purchasing a custom domain if you choose to do so.
I hope this is a clear explanation. Please let me know if you have any more questions!
