For example, if you were submitting Assignment 3, the correct command would be submit -N A3 csc209h filenames, where "filenames" is the list of source files you want to submit, separated by spaces. (E.g., "submit -N A3 csc209h *.c *.h Makefile" will submit all .c files, .h files and a file called Makefile, all in the current directory.) ).
Note that it is NOT possible to submit files directly into the submission directory by FTP. You must first transfer the files to your user account, and then run the submit command from your account.
There is now a web interface to the submit program. You can find it at https://www.cdf.utoronto.ca/students. Please read and follow the instructions.