I think you would need to go to the HP support site and download the wlan driver at least, put it on a micro-SD card and install it on your tablet http://support.hp.com/us-en/drivers/selfservice/HP-Stream-Tablets/7439994/model/7482041 (please do check if I linked the correct tablet version, could be different)
after installing the appropriate drivers, i recon it should "realize" it's a tablet