Arduino CH340 Drivers
The Arduino IDE software installs the drivers for genuine Arduinos, however the Nano included in the eChook Nano Kit from Greenpower is an Arduino clone in an effort to reduce the kit price.
The disadvantage is that the clone require different drivers. These are for the CH340 Serial to USB interface chip they use instead of the more expensive FTDI chip on genuine arduinos. This page links to drivers for different operating systems. It is required to install the relevant driver before continuing. Once installed the clone Arduino will behave exactly as a genuine one.
Drivers for mac are slightly more difficult. You can either disable KEXT security (which is not advisable) and get a free driver or you can get a signed driver from here - they do however cost money.
CH340 drivers are baked in, just plug and play.