When your project is ready to be published online, click on the blue Publish button in the top right corner from the project overview page. Now you have to adjust the slider in order to Activate your Project. When your project is active, your publication will be accessible for everyone via the domain URL.
Once the publication is live, on the left side of your project dashboard, you will see a Domain URL. This URL can be shared wherever you like. Accessing the URL via a desktop or various mobile devices will allow them to see the publication.
Even though the publication is live, you can still adjust the settings of the publication or edit the publication itself through the editor. After you have made the changes, then update it to the live version.