removing a links sidebar

http://dealershipsecret.com/ here is my site, the Links sidebar on the left which has under it: “Documentation, Plugins, Suggest Ideas, Support Forum, Themes, WordPress Blog, and WordPress Planet” I want to get rid of all these links and replace them with new ones but wordpress is populated with such a cavalcade of different PHP files it’s hard for me to track down which PHP file the code is actually in. I tried to use grep to recursively search for keywords like “Plugins” and “Documentation” etc… and have come up with nothing. I’m in the dark about how wordpress stitches together this motley assortment of various php files and makes them into one cohesive page. How do I track down the one PHP file that contains this code so I can change it? Any help would be appreciated.