Orca font size

Ok I have gone into the orca/layout/base_en/css/main.css and altered everything with a number i have also gone into the main.css file and screwed around I can not alter the text size in the orca forum! you need a magnifying glass to read it also the author pic and number of posts from them is screwed up can someone please help i am suprised there is no other threads on this because it is so important! please help?

make sure you change the file privleges other wise none of the changes will take affect all so you have to totally close your browser out and bring it back up to see changes