Here is a short description how to setup a portable Wifi hotspot on your Samsung Galaxy S3 and how the name and password of the portable Wi-Fi hotspot can be configured.
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Step 1: Go to settings / more settings
Step 2: Choose Tethering and portable Hotspot
Step 3: Activate “Portable Wi-Fi Hotspot”
Step 4: Click on “Portable Wi-Fi Hotspot” in order to read the description how to connect other devices with our hotspot
Step 5: Click on “Configure” in order to configure your portable hotspot and enter a new name and password.