Click the first letter of the color you want to use, click the up arrow to enlarge the "Weapon" (pen), click the down arrow to shrink the weapon size, and click 1 to MESS UP STUPID @!#*$!# BEIBER!!!
HE SUCKS!!!!!!!!!!!!!!!!!!!... There may be some glitches... but don't worry.. you can click space to clear (such as the glitches).