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I did see this question but was still unsure as I've never setup a cron job on my own: http://forum.sendy.co/discussion/153/cron-job-and-1and1/p1
So I started by Googling the question and came up with this specific 1and1 tutorial: http://help.1and1.com/hosting-c37630/linux-c85098/cron-jobs-c37727/how-can-i-create-a-cron-job-a595882.html
I followed it along fairly well, but I'm still not really sure about where to input the command and cron job information. I got as far as logging into the ssh thingy using Terminal on my Mac and creating and editing the cronTest.php file.
If I could have a little bit of guidance along where to go next, it would be greatly appreciated. Thanks!
Contact 1and1 support for guidance on how to setup a cron job on their server. Send them Sendy's cron job instructions if you need. This is within their scope of service and they should be able to help you better.