You should get a DigSim window shortly. Try making a simple
circuit and saving it. When you save a circuit, you will be presented
with a standard X11 file navigation "dialog box". Navigate to your own
home directory and save the circuit there. You won't be able to save
the circuit in my directory.
When you've finished question 4, save it. Relaunch DigSim and
reload the circuit, just to make sure it's there. Then submit the .sim
file using the Unix submit command: