Chris Wanstrath discusses how users can now add multiple email addresses to their GitHub accounts, which is especially useful for ensuring that commits are correctly linked to the user's profile. He explains that if a commit is not linked, it might be because it was signed with a different email than the one associated with the GitHub account. To resolve this, users need to add the relevant email address to their account. For those unsure of the email linked to a commit, he suggests using the command `@git show @` with the commit’s ID. Currently, the email address used during signup cannot be changed, but this will be possible in the future.