When using telent go to your telnet and then cd to where you have newnews.pl located at and type in ./newnews.pl then enter the script will run. for telnet you can download putty.exe here at this link
http://www.chiark.greenend.org.uk/~s.../download.html
or here
http://www.realwebhost.net/putty.exe
when using a cron job this is my example i run a cron job every 15 minutes like this
0 * * * * /home/realweb/newnews.pl
15 * * * * /home/realweb/newnews.pl
30 * * * * /home/realweb/newnews.pl
45 * * * * /home/realweb/newnews.pl