some questions about using Ubuntu

[loody]

Dear all:
I have several question about using Ubuntu.
1. Is there hot key to switch desktop?
I google the keyword and find the alt+ctl+left/right will be ok,
http://ubuntuforums.org/showthread.php?t=450232.
and I also find my keyboard hotkey setting is correct as the attach png.
But it is still fail, except alt+up/down I set manully.
Did I missing something?

2. I want to change the color of directory and google it,
http://ubuntuforums.org/showthread.php?t=112879.
But I cannot find the config file that store the setting of my color
of directory.
( I also man dir_colors)
Is it /etc/profile, ~/.bashrc or something els?
appreciate your help,
miloody
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