You can change your Email Address from the My Profile page:

To update your Password:

1. Go to My Profile under Settings & Account in the top right of the page.

my-profile

2. On the right side, click Change Password.

3. Enter in your current password, your new password, and then retype your new password to confirm it. Your password must be at least six characters long.  

settings-my-profile-password

4. Click Update.

If you’ve forgotten your password, enter your username on the forgot password page to reset your password.