How to add a new page in a pre-built theme

We just purchased an iTheme pack of three templates. When we installed a template, only the HOME page shows in the bar area where all top level pages should populate. When we build a new page, there seems to be no place to say where this page should go. In the older version it was easier but the new version must have a new button or setting that we cannot find for the life of us. Thanks.