use putty to login to a shell (using ssh)
http://the.earth.li/~sgtatham/putty/.../x86/putty.exe
fill in the hostname and go
then use your login name and password
then on the shell
crontab -e
(you'll go into vi .. so editting is started with pressing i
and exit/save is "escape wq!" sequence)
http://www.adminschoice.com/docs/crontab.htm
shows how to setup a crontab
hope you allready solved it .. since its over 4 months old
otherwise .. hire some monkeys!