When a student encounters an Activity Button on a lesson page of a course, have the student click on it to download and print the assignment. An Elementary student may have a workbook, if they do, direct the student to find the workbook page that matches the pdf document downloaded from the lesson and complete it.
At specific points in a module, your student will be asked to submit assignments. Most assignments will have the word assignment in the title of the activity. An elementary student may have to scan their documents and then upload them into the assignment dropbox. The Getting Started Lesson in the Resources Module describes how to submit assignments for PDFs that you can type on. You can also preview the video below.
Please reach out to your teacher if you have further questions on how to submit your assignments to Dropbox.