The order is
1. Install FRC update suite. This gets you the driver so that the USB connection to the roboRio shows up as an internet connection. This is on a Windows computer, not MAC or Linux.
2. Power up the roboRio (It is on isn't it?) and plug in a USB cable. You should see the driver installed. The IP address of the roborio will be what you correctly stated: 172.22.11.2. You should be able to ping it.
3. Connect to the web interface of the roboRio. Use Internet explorer not Chrome because IE supports Silverlight.
4. Log in and update the firmware of the roboRIO
5. Now running the imaging tool.
Follow this step by step:
http://wpilib.screenstepslive.com/s/4485/m/13503