What is your current plan?
Keep in mind that you can't add "just" MSNBC. Cable TV doesn't work that way.
Thank you for posting, johnp189! As ThatDonGuy mentioned we can't just add an MSNBC channel but I can check what options we have. Please send me a private message and include your full name, the account holder's name as it's listed on the billing statement. Click on my name ComcastElla, then click Send a message.