If you're not about that wired business, and followed all the Bluetooth installation steps above, you should be able to simply unplug the controller, and after a couple seconds it will sync via Bluetooth. Some games let you manually choose your button icons, though.
Unfortunately, this means that it won't register as a PlayStation controller to the few games that have native DualShock 4 support, so you won't get the correct Square/Cross/Triangle/Circle button icons by default.
Any game with native XInput support-pretty much any modern PC game that supports gamepads-should recognize it without a hitch. Now that it's installed, the Dualshock 3 should behave like an Xbox 360 controller. Voila! Using it Using your Playstation 3 controller on PC If you plan to use your PS3 controller with the emulator, click Browse to navigate to your PCSX2 installation folder, then click Enable to install the patch. PCSX2 emulator note: The PCSX2 settings tab allows you to patch the emulator's LilyPad controller plugin to support the pressure sensitive buttons. To disable them, click the Sound settings tab and uncheck "Enable notification sounds." ScpToolkit starts up with Windows by default, and also plays some sound effects that you might find obnoxious. Most of these settings you should be able to leave alone. Here you can change some settings like disabling rumble, adjusting analog stick deadzones, and more. Look in your Start Menu for ScpToolkit Settings Manager. Now that it's installed, you'll see ScpToolkit as an icon in your system tray.