Enter "Baisoku" as your name (in hiragana) to activate the Speed x2 mode. It will make all the notes scroll 2 times faster.

If you cant read the hiragana well, here is the sequence you need to enter it as (all directions are from the upper left corner):
Ba: Down 6 times, Right 5 times
I: Right 1 time
So: Down 1 time, Right 4 times
Ku: Right 7 times