?MT-NW: User hilite color?

How do you change the user's background highlight color for posts by the 
user in MT-NewsWatcher (in the thread list). It defaults to a vivid 
pink, or perhaps electric raspberry. Many years ago when I first started 
MT-NW, I think I had an option to choose a different color. I've looked 
all over the app (including the docs) and can't find where to set this 
attribute. I presume this setting is somewhere obvious, but I can't find 
it.

Any help will be greatly appreciated. Thanks.

--Fred