You can see the message feature after you've posted for the first time. You should see a little mail icon next to your profile picture and notification icon in the top right now.
Good morning @Monica10414 and thank you for reaching out to our Digital Care Team on our forums. We hope that you and your family and staying safe during this time. We appreciate your patience and are happy to do what we can to help. For customers who are evacuated and/or unable to return to their homes for an extended period of time, but would like to retain use of mobile apps such as Stream TV, Connect, My Account, Xfinity Home, and more, we'll enable them to do so for up to one month and will significantly reduce their bills during this time. Please send us a message if you would like to explore this option. To send me a Private Message, please click my name “ComcastAlyssa” and click “Send a message."