Things You'll Need
Instructions
Connect your Action Replay device to your computer via the USB cord that came with the peripheral.
Open the Action Replay Code Manager software. The software is provided on a CD that is packaged with the device.
Right-click on the "My Codelists" panel on the bottom-right of the screen.
Click "Add new cheat." A new window will appear.
Enter one of the game's numerous cheat codes into the device (see Resources). The cheat code will automatically be uploaded to the Action Replay device.
Disconnect your Action Replay device from the USB cord.
Insert the Action Replay device into your Nintendo DS console. The device should fit snugly and the device's exterior slot should be visible so that you can fit another DS card into it.
Insert the "Sims 3" card into the device.
Start your Nintendo DS and the "Sims 3."
Activate the cheat's trigger.