how change notices color?

[.m.]

in the global.css of the theme you can change background color used for .pm_alert

and for reputation text you can add style property like below at the bottom of global.css

[class*="trow_reputation"] {color: brown; text-shadow:  none;}

note: stylesheet of theme needs to be edited through themes section of forum admin panel
and it should be edited through advanced edit mode.

you may have to hard refresh your browser [eg. press CTRL + F5] on forum index after saving changes to stylesheet