As there is tens of chipsets, et hundreds of Wifi dongles, the user needs to install the one he has. So its not an easy task but is possible, finding first the PID:VID of the Usb dongle, deduct the chipset, check if that PID:VID is supported and the chipset on the feeds and if it is, then installing the driver, firmware for it, and the various plugins (wirelesslan, and wpa2/wpa encryption libraries). On the support forum of the image, you have all these details explained.
TS