You can also access the platform on your phone instead of a computer. Your tutor or school will tell you which app to open: either an app with your school's own name on it, or an app called My Online Classes, available for iPhone and Android.
If you're using My Online Classes, the first time you open it, it will ask for a code. That's a code for your school, not your email — ask your tutor or school for it if you don't have it.
Once you're in, sign in the same way you would on a computer.