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In Comcast email, the user ID IS the email address. You create the user ID for a secondary account, and then tack on @comcast.net. You can then sign into the account with the ID and password you created for it.
If you mean you want to add an outside account like Gmail or something using the mail fetching feature, then from the Inbox page to to Preferences>>>>>Email>>>>>>>Email Accounts.
You can have up to 6 additional secondary email accounts in Comcast besides your primary account. Sign in to the account with your primary user ID. Here's the instructions-------------