How do I get my download code to download certain apps

Hello 5kidsb,

To start, you'll want to provide more info on your post on what this download code is. You shouldn't need any sort of code to download applications. To download applications, you would just go into the App Store, search for the item you want, then press the Get button (if the item is free) or the price button to download it.

Download apps and games on your iPhone or iPad

Are you talking about adding a payment to your account so you can download applications that are not free? If so, you can use these steps to add a payment method to your Apple ID account:

1. Open the Settings app.
2. Tap your name.
3. Tap Media & Purchases, then tap View Account. You might be asked to sign in with your Apple ID.
4. Tap Manage Payments.
5. Tap Add Payment Method.    

 6. Enter the payment method details, then tap Done.

Add a payment method to your Apple ID

Cheers!