To read your channels, simply open the app and start reading.
If you are logged out, you will be prompted to log in when you open the app.
Log in with your registration login details: Email and Password.
Don't worry if you have forgotten your password. Just click on "Forgot password?" at the Login screen and create a new one.
Android: Simply tap open the menu at the top left corner of your device screen and log out.
iOS: Go to "Settings" by tapping on the cog in the top-right corner, then click on "Sign Out".