The Starter Theme includes two spaces where you can add custom Textpages to the navigation of your store. This can be done in the fullscreen Header navigation or in the Footer.
1. First create your new Textpage. Go in the backend of your store to CONTENT/PAGES
2. Make sure you've set the visibility of the page on.
3. Go to DESIGN/NAVIGATION
4. Here you'll see the default option. Click on the Default title to open its settings. Here you'll be able to insert links to products, pages or custom URL's. This navigation will be displayed in your store's Header Navigation. Now choose the URL of your newly created Textpage.
5. To display a link in the footer use the button "Add menu". Call the menu "footer". This is important as is will not work otherwise. Click on the title link. And create all the links you want to show in the footer.