Changing the text color of current page in navigation/menu?

Hi all,

i;m using this template call Breath….

http://themeforest.net/item/breath-wordpress-theme/full_screen_preview/1363516

Would anybody know how I would change the text color of the current page in the navigation/menu from say white to orange?

I’ve used Firebug but can’t work it out.

Many thanks.