To add a new page to your site, do the following:
1. If you aren't already, log in by clicking on the + in the top right hand corner of your website
and login using the login form provided.
2. Expand the Build. toolbar by clicking on the gears in the top left hand corner, expand the pages menu and touch / click the add page icon.
3. Fill out the resulting form shown to you in a modal popup and hit the "Continue" button.
4. You will then be presented with a layout selection whereby you will choose your desired page layout. Different templates have differing number of available page layouts, and you can preview them and select them from this screen.