Larger view of the issue is here: http://i1268.photobucket.com/albums/jj572/LinuxOwner/question.png


Question: How to find the files in magento directory
Answer: The class for this block is defined in the file Mage/Checkout/Block/Cart/Totals.php
If you open this file you will find renderTotals() defined here. I think you are interested in making changes here. If yes, you can override this class and make your changes.