How to submit your solutions to AFS hand-in directory (AFS: Andrew File System)
Option 1: Use a File Transfer Client, such as SSH Secure File Transfer (can be found at https://www.cmu.edu/myandrew/ under Software)
Connect to unix.andrew.cmu.edu and enter your userid and password.
You will now see your personal account on the remote AFS directory as shown below:
For the remote name, type in /afs/andrew.cmu.edu/course/24/780/, followed by your user-id directory as shown below. Then, drag and drop necessary files from the left pane (local machine) to the right pane (remote AFS directory)