Things You'll Need
Instructions
Click on the Apple icon in the upper-left corner of your Mac's screen and choose "System Preferences."
Go to the "Sharing" control panel underneath the "Internet & Wireless" heading.
Check the box next to "Internet Sharing."
Open the "Share your connection from" box and select the "Ethernet" option.
Check the box next to "AirPort" or "Wi-Fi" in the "To computers using" section.
Turn on your PS3, navigate to the "Settings" menu and select the "Internet Connection Settings" option.
Choose the "Easy" setup option and then pick "Wireless."
Select the "Scan" option and then highlight the wireless network that includes the name of your Mac computer.
Press the X button on your PS3 controller to connect to the network created by your Mac computer.