Today, we enabled new app creation and management functionality in the developer portal. Premium API developers with approved developer accounts (and who are admins of the account) can now create and manage their apps in the same place that you manage product subscriptions and billing on developer.twitter.com.
If you are the admin of an approved developer account on developer.twitter.com, you simply need to login to your account and navigate to the new “Apps” link at the top of the page. From there, you’ll be able to create and manage your apps. All other developers can continue to create and manage apps at apps.twitter.com.