In the overview of the pages of your project, move your mouse over the Duplicate Page icon on the desired page you would like to duplicate. This icon looks like two pages/documents, standing behind each other. Clicking this icon will duplicate that page to the bottom of the page list. The duplicated page will maintain all the elements, settings and name of the original page.
TIP: when you duplicate a page you can edit it without the original page being affected by the changes.