When you click on an assignment, it will open the Details & Information panel. The panel will display the due date, number of attempts allowed, and possibly a time limit or a grading rubric. If the assignment is past the due date, it will say "Past Due", your instructor will have it set to allow or not allow late submissions. Review the grading rubric for details on assignment requirements and instructions. 

1. Click on 'Start Attempt'
2. You can change the name of the file or leave it the same
3. You will be able to preview the file submission
4. You can remove the submission attempt or hit 'Submit'