Question Cannot find Tethering in Asus nexus 7 3G

Hello,
I have Asus Nexus 7 32gb 3G with Stock rooted Android 4.2.2. I'm trying to make it as Portable Wifi Hotspot. But when I open Settings -> Wireless & Networks -> More, there is no option for Tethering and Portable Hotspot.
Can you help me?