Need some help with Colors (thread by username)

[Painful]

Well i already colored the usernames with the usergroup settings but i also
want the Usernames to be colored at last posts.
Also Example:
05 Jun 2004 03:45
by filburt1
Here i also want to have the usernames colored with the color settings from
the Usergroup but i dont know where and how to modify the Code. It would
be very nice if you would help me with that. Thanks in afore

ps:
i got vbulletin 3.8.4