If you can log in:
On the website, click the icon in the upper left corner and then click Account (theathletic.com/settings). You can change your Email or Password under Account.
On the app, tap the button in the top left corner, and then the button next to “My Feed”. Tap the icon to the right of your name to make any changes to your display name or Email. You cannot change your password in the app at this time.
If you can't log in:
Change your password at theathletic.com/forgot-password and then move on to the steps detailed above. Resetting your password at the link above will remove your Facebook data as well, so if your workplace blocks Facebook Login to The Athletic, you can reset your password to remove the Facebook data and sign in using Email/Password at work.