How to change colors on post to wall section.

How do you change the colors of wall post text ...see how faint it is?

You'll need to use "Firebug" in Firefox in order to determine what CSS file and corresponding element needs to be changed.  You can download Firebug here:

http://getfirebug.com/

After you install it, all you'll need to do is right click the text & choose Inspect Element.  It'll show you exactly what you need to change.