Moving Add to Cart on the product page

Hi, does anyone know how to do this?

I have followed the instructions below:

"In /includes/templates/your_template/templates/tpl_product_info_display.php, move the block of code beginning with <!--bof Add to Cart Box --> to wherever in the sequence you want it to display. In some cases it will be necessary to tinker with <br class="clearBoth"> tags to get it working just right."

But nothing happens. Is there something i need to do in the admin?

I trust you understand that the reference in the path to your_template means that you save the edited file in the appropriate template folder that you are using... eg: if the template you are using has folders called avocado, then you will save the edited files to:

/includes/templates/avocado/templates/tpl_product_info_display.php

I followed the steps above. I copy the tpl_product_info_display.php file to my templates directory for my custom template. When I do that, my cart goes blank. What could be causing this issue?