It is very easy to know what template positions are available in a Joomla template(free or commercial) in Joomla. You need this information to know where to publish your modules / other content. For this tutorial, I’ll use my favorite Beez20 on a Joomla 2.5 Installation.
By default, template preview / template position preview is disabled. So all that needs to be done is to enable it.
a) Login to your Joomla administrator backend interface.
b) Click EXTENSIONS >> TEMPLATE MANAGER
c) The Template Manager: Styles window opens: Click OPTIONS
d) select ENABLED in PREVIEW MODULE POSITIONS
e) click the SAVE AND CLOSE button, refresh your screen.
To preview the template, click PREVIEW.
Below sample screenshot is the upper part of the template. Sample positions are circled: positions: top, position-0, position-1…..
To publish or un-publish a module in a position requires just changing the status of the module in Module manager.