To process credit cards manually rather than using a Payment Gateway, you must set up a Manual Credit Card Payment Gateway and assign it to the Event/Organisation that requires this functionality. This is done in the Misc Settings > Payment Gateways section.
When filling in the payment gateway form, select the Manual Processing payment gateway.
Due to PCI regulations, Currinda will never store credit card information. You will be required to arrange some other method for the paying party to send their credit card information to you.