I went and entered text into the HTML tab section in Wordpress and updated. However, still no theme. Then I clicked on the 'Preview Changes' button and then tied to add a new theme but when I tried to install it again there, it said the theme already exists! So how do I use the one that I supposedly already have? LOL
On the right hand side of the editing screen. You should see the box title Page Attributes. In this box you should see the option for Template. What does it say on one of the pages that doesn't display the theme?