Cars race-o-rama ds

HiMy son is driving me insane about this game, he wants to play all the levels etc but I suck at it so it's going nowhere :-\I found the cheats online... but how do I use them ???

http://cheats.gbatemp.net/Put the cheat database in your SD.
Activate the codes.

Press the button for the cheat database of your card,
Press A at the cheat you want to activate,
Save,
Play.

... ??? and where do I find that cheat database?

Replying to #4

Put it in your cards firmware folder.
Like:
_system_\usrcheat.dat
Or
_system_\cheat.datIf the lower screen says "Cheat" tap it.
Or else there are no available cheats.

Thank you Wild_kat ;)Thank you Yoshi ;)

Replying to #6

Your welcome Miss_G