First, write your 2-3 page assignment given the html guidelines explained off the front page (see links). Make sure your file is titled asst#.html. Put the assignment in its own separate directory with any files it may need. The turnin tool submits a whole directory.
To submit, login into a linux machine on the cs network and enter the directory of your assignment and do:
/u/cs240/bin/TURN_IN .
You'll receive an email if your assignment was received correctly.
Make sure your final verion of the assignment is submitted before 11:59:59 PM of Thursday.