Step 1: In the Joomla Administrator go to: Extensions > Template Manager
Step 2: Now click on the template name. This opens the Template [edit] page.
Step 3: Click on the “Preview” button present in the top right.
Note: In some cases this preview will “break” the template design. Don’t worry, this only happens because of the added divs showing the template positions.
Click here to view this article as Oryon knowledge base video tutorial playlist.