When you log into one of the CS lab Macs, the "Connect to Server..." dialog box should pop up shortly after the Desktop appears.
If this isn't present, open Finder, then choose "Connect to Server..." from the Go menu, or hit command-K
Type or paste in the server's address: smb://athena.cs.mtholyoke.edu/
Enter the same name and password you use elsewhere on campus.
An icon of your home directory should appear on the Desktop.
When finished, disconnect from athena by using one of these methods:
drag the home directory icon to the Trash
right-click on the home directory icon and select Eject
log out of your user session by selecting Log Out from the Apple menu