After logging in to edit your website, the admin area looks like this.
Down the left-hand side of the screen, you'll see the names of the pages in your website. If you only have a single page, this will be displayed as "Home". Or if your website has several pages, they will all be shown here in a list.
It's as simple as that - to start editing the home page of your website, click the page name "Home".
The words "Singlepage site" shown at the top of the admin screen are a link back to this main admin screen. Wherever you are in the website admin area, you can click "Singlepage site" to get back to the main screen.