Did I do this cron job correctly?

I just followed instructions from Gopiplus to set up a cron job. The idea is to send out an e-mail automatically to my subscribers just once a week rather than with every new post as it is now, using Gopiplus's subscribers wordpress plugin. Being completely computer illiterate, I'm nervous that I didn't follow the instructions right. Can someone check and make sure I did it right? Here's what the table at the bottom says now:

Minute Hour Day Month Weekday Command Actions
0 0 * * 0 /bin/wget -O /dev/null “http://rachelheller.org/?es=cron&guid=udnish-bdyimt-stzobg-lypdti-jbgcua"

So did I do it right? The inmotion help center has instructions for automating e-mails, but not for this plug-in. I'm afraid if I switch plug-ins I'll lose the few subscribers I already have! Many fellow bloggers recommend mailchimp, but I'm afraid to switch over. Any help/reassurance would be greatly appreciated!