This is primarily a peer-to-peer public forum of Comcast customers. There are Comcast agents that peruse the forum but it's variable as to when someone will see your post and respond. It may be a couple days or a couple hours. If there's something you want to watch today, you might continue calling 800-COMCAST or 800-XFINITY and try getting a live agent.
Welcome to the Xfinity Forums. @jav6joev is correct. Sometimes us Official Employees here may not see your post right away. We apologize for the delay. 'd be more than happy to help add HBO to your account if it hasn't been done already. Can you please verify your first and last name in a private message? To send a private message click on my name "ComcastChe", then click send a message.