Samsung GalaxySIII User Manual page 259

To secure the Portable HotSpot service:
The two most common methods for securing your connection
to the HoSpot are to a security method (WPA2 PSK) and to
Hide your phone's SSID name.
1. From the Home screen, tap
(Mobile HotSpot).
2. Tap Mobile HotSpot
3. Tap the Security field and select WPA2 PSK.
4. With security enabled, enter a new password into the
Password field.
Important! The more complex the password, the harder it will
be for intruders to break your security. It is
recommended that you not use names, birthdays,
or other personal information.
5. Tap Save to store the new settings.
(Apps)
Configure.
Connections 253