How to log out:
Desktop:
To log out, hover over the settings button in the upper right-hand corner of the screen, then click Logout.
Mobile browser:
To log out, click on Me on the bottom right of your screen and scroll all the way down, then click Logout.
App:
To log out, click on Me on the bottom right of your screen, then click Settings under your profile picture and scroll all the way down, then click Logout.
How to Log in:
To log in, enter your email address and password, and then click Login. If you're using a private computer and want the site to remember your username in the future, check the Keep me logged in box. You will still need to enter your password each time you log in.