Some informations modules to be editted

these three information modules -> About Us , Privacy Policy, Terms and Conditions
, may i know how can i edit them? thru which directory?

cos for another 2 modules -> Contact us , Sitemap
, i can edit these 2 thru the directory ..../catalog/controller/information/*.php,
but i jus cant find any for the 3 modules i mentioned above.

anyone can help me ? thanks..

Information modules are entered through the admin panel under Catalog->Information