When you get into that room using the blue elevater you go to thr machine in the top left corner then when that loads to put in the cheats you have to know where the numbers and letters are witch i'll show you now
1 2
a b c d e

f g h I j

k l m n o

p q are s t
3 4
The numbers are in the corners and the letters are as close to where they are on the ds screen as possible so I hope this helped :D :)
Happy cheating!!!!! :D