In the dashboard under the pages item, click 'Add New'. You will see an option to add a page title, give your page a title then click the purple button labeled 'Use the Divi Builder'.
PLEASE NOTE: YOU MUST SELECT A TITLE BEFORE PRESSING 'USE THE DIVI BUILDER'
You will now see the page above. Click 'Choose Page', you can then choose from one of your existing pages and clone the styling from that page.
Choose from one of your existing pages to copy from and you will see the page below, notice how it has been populated with content. Click 'Build on the front end' to see & edit the page and make any changes you need, click here for full instructions on how to do so
If you don't want to copy an existing page and want a new custom page, email email@example.com and we can create a page for you.