Go Styles -> Modify -> [fonts/colors/etc] -> 'Head Insert' section.
You have this (I went to the url in your screen and viewed the source since the <head> is the same for all pages

):
Code:
TEXTAREA, .bginput {
FONT-SIZE: 12px;
FONT-FAMILY: Verdana,Arial,Helvetica,sans-serif;
COLOR: #F0F0F0;
BACKGROUND-COLOR: #DFDFDF
Change the part that says 'COLOR: #F0F0F0;' to the font color you want.