How do I delete all of the old email addresses I had to use when I set up my new emails on Xfinity (Comcast).

How do I delete all of the old email addresses I had to use when I set up my new emails on Xfinity (Comcast). I went to the online website, pulled up my account and tried to delete my “Personal Email Addresses (old)” and keep all of my “Comcast Email Addresses” New on Xfinity. There wasn’t ANY prompt I could use. The old email addresses don’t work any more anyway when I switched to Xfinity. The pop up on my TV when I’m trying to add a new steaming app, etc… very confusing on Xfinity website. I currently have 5 New Xfinity/Comcast email addresses. I am trying to delete the old email addresses I had to use to set up my new Xfinity account (q.com) Thanks for any and all advice on how to delete these old email addresses. :)