The vast majority of subjects are in LessonUp. However, if your subject is not there, you can easily add it.
Step 1
Go to options in LessonUp and then to settings.
You can now select a subject, but if it is not listed, you can enter it. To do this, go into the entry screen behind subject.
Step 2
You can now enter your own subject. After you press enter, the course is added. This course is now available for all your subsequent lessons.