Edit your Account Information
To edit your account information and settings, click your profile photo/name on the top right of the homepage then click on the settings icon in the upper right (looks like a gear).
Change Email Address
If you want to change the email address on your account, go to profile settings and click in the email box and type in updated email address.
If you created your account via Email, you can change your password in your profile settings by clicking in the password box and making desired changes.
If you created your account via Facebook or Google+, you can add a password to your account by pressing the ‘Add Password’ button