Submit Credit Card Membership (or Event Registration) Not showing in Admin
Looking at your issue: See CRM-15394

David Greenberg added a comment - 30/Sep/14 12:03 PM
The back-office 'Submit Credit Contribution' feature is only available when the site has at least one configured payment processor of the type that allows credit card data to be entered within CiviCRM forms. This includes Paypal Pro, Auth.net and iATS. The link is hidden on the demo because the configured 'Test Processor' does not support this.