Click the "Edit content" button you see in the header. You will reach the Login page to access the Admin area.
Log in using the user credentials chosen upon registration.
On the left you see a sidebar with the example pages created for you by the CLI: click on the "Home" page. You should see something like this:
On the central panel you can see the content that you can edit visually. On the right sidebar you can see the properties for the page.
Look around! Take your time to explore the interface: in the next page we'll edit some content.