When you want to share a lesson with your students, it is best to do this with a class. This way you can share the lesson with all students in once. Also you will be able to access lesson reporting. More about that in the course 'Keep track of student progress'. Once you shared the lesson, it appears in the students' account on lessonup.app. The students can then go through the lesson at their own pace.
It is also possible to share the lesson with specific students in that class. Choose 'select students'.