Call of Duty game issue on iOS7?

My friend and I recently purchased Call Of Duty: World at War Zombies for iPhone 5 on iOS7 and it says we need a validated account. We go to extras>profile>create new account and when we try to create a profile it asks for a username and the keyboard doesn't come up. Suggestions or solutions would be greatly appreciated!

Solution: Don't buy CoD on mobile devices…

Try killing the app by double clicking the home button, it'll pop up and drag the app upward with your finger. Then restart it and try again. If that doesn't work try shutting it down and rebooting it.

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