How to install template in Oscommerce

Hi,
i a new oScommerce user.i need to change its template.how can i change?

 

there's a lot of files to change but you can use STS for easier management and to edit of your templates.

 

thanks for your help.
but more easy way?

 

edit

includes->header.php
includes->left_column.php
includes->right_column.php
includes->footer.php

contents are much similar.

 

thanks i think i can edit now.a green rep is going to you for this help

 

greep rep? what's that?