You can add up to seven sub pages on certain website pages, if it's possible to do you will see a blue box 'Add sub page' see below:
In order to add content and edit your sub pages, you will need to save the page you are working on before proceeding:
Choose a page. Click on 'Add sub page'. Scroll to the bottom of the page and click on 'Save page changes'.
Now the system will allow the pages to be added, so you can click on 'Edit' and enter your new sub page details. If you wish to 'Delete' the sub page you would do it here.
You can then choose if you want the page to be shown on your website (make sure the button is blue not grey), add navigation text and your meta description.
You can then upload a photo, choose a page heading and enter your page text.
Finally, remember to 'Save page changes'.