To change your email address:
Go to Settings
Click "Login and Security" (or click here to jump to it directly)
For the E-mail Address > Click "Configure"
Enter the new email address and enter your current password
Verify your email address by checking the inbox of your new email address. Find the verification email and click the button in the email.
To change your password:
Go to Settings
Click "Login and Security" (or click here to jump to it directly)
Password > Click "Configure"
Enter the current password and enter your new password twice on the right
Click Save