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**Before running the application configuration is required.
SETTING: Settings->More..->Tethering & portable hotspot->Set up Wi-Fi hotspot
http://support.google.com/android/bin/answer.py?hl=en&answer=1650164

Rename or secure your portable hotspot

You can change the name of your phone's Wi-Fi network name (SSID) and secure its Wi-Fi network when it's acting as a portable hotspot.

Go to Settings > Wireless & networks > More > Tethering & portable hotspot.
Make sure Portable Wi-Fi hotspot is checked.
Touch Configure Wi-Fi hotspot.
The Configure Wi-Fi hotspot dialog opens.

Set your name and security options as follows:
Change the Network

TO USE: Just touch Portable Wi-Fi hotspot icon on / off