Good stuff, glad you like it.
Tap on the \'Settings\' tab, tap \'Light and Power\' you will see two sliders, one for the brightness on battery power, one for on external power. You can also select if you want the screen to auto-dim on battery power. To control the brightness on the fly, hold the blue [Fn] key down and press [1] or [2].
Ask as many questions as you like, enjoy! :-)