Is there a way to alter or delete assignments post submission? I simply copied and pasted a mini presentation assignment each week for students to access the most current presentation for three weeks, so they would be able to comment/provide feedback on the newest post. But now in my gradebook, instead of having 10 points per student's presentaton, I have it 3 times, meaning 30 points. How to fix? It won't let me change the erroneous two copies.