To access the page settings click on Pages and on top of each page you have a pencil icon that opens the Page Settings.
In the Page Settings you can adjust the access levels. Pick "Public" to publish your website/page/LMS/e-Store.
You can have the page:
Public - visible to everyone
Password Protected - requiring a password to access
Members Only - only members of a specific group would have access to that page
p.s. Don't forget to connect your own custom domain before publish.
ref: https://kb.instantpage.dev/hc/connect-a-domain/connect-a-domain