Visit the Xfinity TV website in your browser of choice. (See Resources)
Click "Sign In" in the upper right corner of the page. A new page opens, asking you for your user name (Comcast ID or email) and password. Enter these in the appropriate fields and click the "Sign In" button.
Click the category you want to watch in the menu bar at the top of the screen. You can browse by television series title or by the network that airs the program. There is also a category devoted exclusively to content appropriate for young children (titled "Family"). For example, if you click "TV Series," you can click the Fox series "Bones."
Click the "Play" button for the television series episode you want to watch.