You go to internet connection on your PS3 and you must have a Wireless modem or router. Then you must unplug the ethernet cable from the back of the PS3 because as long as it it connected the PS3 will not search for a wireless connection. When your PS3 begins the search it will first tell you that the ethernet cable is not available and then provide a list of WiFi connections it has discovered. I was able to use automatic to connect and if you have problems see the PlayStation Network site for troubleshooting internet connections.
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You can use a wireless connection if you have a wireless router
I believe that the PS3 has wireless capability for controllers. If you don't have a PS3 wireless controller, then buy one at any electronics store. The wired controllers have a USB connection at the end of it.
You purchase a router in ether wireless or wired for your PS3 or you can connect wired with an ethernet cable directly between Cable or DSL modem and the back of your PS3. Routers allow you to split your internet connection and provide a connection to multiple devices like to your PC, PS3, Smart TV, and a laptop. Routers can be wired with output ports for ethernet cables or wireless for WiFi connections and those normally include outputs for wired connections. They are installed by plugging a ethernet cable from it's input into your modem's output.
First you need a DSL or Cable internet service. Then you need to have a router if you don't have one already. Connecting the PS3 can be wired or wireless and the related link has procedures
either buy a wireless bluetooth mic, or wired mic. connect or plug in the mic and then should be ready to chat :)