Why don't you scroll all the way over to the settings tab in sense... tap menu... tap all settings... tap system... tap power... tap backlight... Use the scroll bars under backlight adjustment to lower the brightness...
Or...
scroll to settings tab... tap sound & display... scroll to bottom of page... tap backlight... Use the scrolly bars...
The scrolly bars will only work if you unsellect the Automatically adjust backlight option...
Haunt Alaska
p.