You can change your email address by going to the Profile page and click the Edit button to update your profile. You can also, go through the activation process at SFChronicle.com/activate again to create up to a max of five logins.
Member Services can disable logins in case you have ones using old/unavailable email addresses. To do this, please submit a request to the team.
You can change your iPad login from the Manage Subscription menu option within the app.