Chron job error: No such file or directory

Hi, guys -

I'm having trouble setting up my chron job. I've followed your directions for my host (SiteGround), and entered this string:

/bin/wget -O /dev/null "http://yoursite.com/index.php?option=com_easysocial&;cron=1"

I've tried replacing 'http://yoursite.com' both with and without 'https' and both with and without the 'www;' everything seems to give the same error. Please help me figure out the correct string: I was just about to go back to marketing the site when I discovered the problem!

Thanks!
Cheryl