To scan business cards in Evernote, you need to make sure that a proper device is attached to PC. For example, Doxie will help you do this. The manufacturers provide the device and the software. Once Evernote is installed, use the device to SCAN a card. After you get the results and Evernote is installed, use the Send to Evernote option and it will be automatically sent to your account.
Doxie website: http://www.getdoxie.com/