To register yourself on the system using the mobile app you have to press on SIGN IN on the home screen:

Then you'll need to fill in the form with your details.

Once you have filled in all your details, press on NEXT and you'll see the home screen again where you can now, use your email and password to enter the app.

Other option would be access through Facebook, where the only thing we need to do is press on the option Connect with Facebook.