Signed up for one or more subscriptions with the wrong email address or want to transfer your existing subscriptions to a different Substack user?
To update your email address for your Substack profile, head to your account Settings page: https://substack.com/settings. At this time, changing your email address on the Substack app is not available.
Click on "Edit" in the Email section.
Enter your new email address and click "Save". This will change the email address on all of your Substack subscriptions.