Help with pokemon platinum

Hi, im trying to use the bag cheats on pokemon platinum on my r4, and it says i need to press select and up to use the cheat, but when i enable the cheat, save and exit and then start the game, i dont have the 99x tms & hms, or 900x berries.ive pressed the select and up buttons repeatedly but still i cant figure out how to do it correctly, any help?thanks

Just use pokesav to edit ur bag.
U can download it here
http://projectpokemon.org/editing/pokesav/pokesavdownload.php