If you want to show a module in the main article of your frontpage, you must use a command for that:
Joomla 1.5: {loadposition content1}
Joomla 1.0: {mosloadposition content1}
content1 is a module position, but you can assign the module you wanna use in a position that is not defined by the template (eg: featuredprod1), and then you can use the {mosloadposition featuredprod1} for joomla 1.0.
If you just want to assign the module to a position already defined in the template just use right or left.
Hope this was helpfull
Ciao