Create new page
When you visit the new project link the first time, you will be asked to create the home page as a blank page of from a template.
To create a new page, you just need to insert the page path into the url address bar in your browser after the hashbang url "#!/your/page_path"
By inserting a new hashbang url, you will be asked to either create a new empty page, clone from templates provided by the marketplace or copy from existing pages you created.
NOTE: Every project starts with an empty 404 page by default, it will be shown to your users if they visit a non-found page, you can customize that page to the design you like.