Your account has been disabled in the App Store and iTunes. How to fix it?

You can't do that yourself. Click here and contact Apple Support at a time they're open; if the link doesn't have an option for your country, use this form.

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Click the blue "Contact Apple Support" link in the article you posted from. Only Apple support can help you resolve the issue with your account that caused it to be disabled.

That link is a direct connection to Apple Support to resolve the issue specifically.