Use the command `turnin' in /p/bin.
Usage:
turnin -submit codeguru assnn `files'
where `files' is the list of files that you want to submit.
Please do include a README file describing how to build your program (include your makefile if you used one). Use the README file to provide any other information that you want to. You might want to state what assumptions you are making, what the user can/cannot do, etc.
If you have any problems, check out the man page - "man turnin".