can't find my verification number to make itunes purchases

Hello there, Kimverley119.

The following Knowledge Base article offers up some great information regarding two-step verification:

Apple ID: Frequently asked questions about two-step verification for Apple ID

http://support.apple.com/kb/ht5570

What if I lose my Recovery Key?

You can replace your Recovery Key any time by visiting My Apple ID:

1. Select “Manage your Apple ID” and sign in with your password and trusted device.
2. Select “Password and Security.”
3. Under Recovery Key, select Replace Lost Key.

Note: When you create a new key, your old Recovery Key is no longer usable. See this article for more information.

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro.