lol, im guessing its the same as mine, with the new natural display (ive scribbled over the model so i cant see what it is exactly)
for the cubed button you hit the x with the little square to its top right and yeah, enter in a 3 there or a 4 to get to the power of 4 etc etc.
umm yeah
make sure its set to deg mode, (the little D at the top of the screen) and for when you want to see your answers as a decimal hit the S<=>D button (bottom left, near AC)
alternatively to all this you can change it so that its like the old calulators, you do this by hitting shift, then mode (both are up top) then 2 and hey presto its just like your old calculator
hope this helps, gl