You can send a message to @ComcastJessie and she can help you.
Thank you for posting here in the Xfinity Forum.
For your forum account, we cannot "delete" it but we can help change the username and/or set up a new username. Please send me a private message if this is what you would like.
If you are discussing your entire Comcast account, you cannot "delete" it to create a new one. However, once disconnected and reconnected at the same place or a new place, you will recieve a new account (but it will most likely be "linked" to the old account).