Assuming you are in the new email format with Comcast, on the Inbox page click on "Address Book". On the landing page, click on "Address Book" again in the left pane. Click on the "hamburger" icon to the right, and then on "Import". Follow the prompts.
I don't see a "hamburger" or anything else about importing. All I see is a lync to "Build your address book". I went in and found an icon for GMAIL, but when I went into the pop-up it had everything but that. I also went over to the right and tried to find information on importing contacts from the Android reference lync, but it just put me on a looping login page for XFINITY. This is a good way of loose a client.