Now that we have imaged the card, we need to prepare Pi for its first boot:
Attach a network cable or your USB wireless dongle to the Raspberry Pi's Ethernet port and the Ethernet port of a switch or router (note that this is not necessary if you have used the Standalone Image option).
Attach the power supply and connect either the composite or HDMI video connection so we can view the installation's progress on a display.
The connection to the Raspberry Pi should now look similar to the following screenshot:
With everything connected, plug in the charger. You may need to change the input on your display device if this does not automatically change for you.
Unless you installed using the Standalone Image option, Raspbmc will now connect to the update server and install. This usually takes around 20-30 minutes on a home broadband connection, as Raspbmc must download the latest version onto your device. This process is entirely automatic, so feel free to take a break and come back later.
When you return, you'll hopefully be greeted by XBMC, the software at the heart of your new media center-to-be. Congratulations, you have successfully installed Raspbmc!