Wow, so cron is involved. That first post was so confusing. Anyway....
0,5,10,15,20,25,30,35,40,45,50,55 * * * * command
I'll concur with netdcon about the fix, though... make sure you upload the file as text. Or paste it into an editor on the server itself. I'm a vi guy, so that would go like this (don't type the spaces between commands, or the brackets around key names):
i [paste] [Esc] :wq
Also if you just type crontab -e that'll take you directly into editing your crontab (so when you save it will be installed automatically) -- I'm not sure which editor by default (I think I remember setting my default editor to vi...).
When you do get it installed, you may start getting errors out of cron (these will be emailed to you automatically) -- for one, cron executes commands starting in your home directory, so unless you put a slash in front of that php path it will try to execute /home/cozyskin/usr/local/bin/php (which is probably not what you want, unless you compiled your own php to that location!).
You can check that the path to send_emails.php is correct by trying to change into that directory, and if that works, listing the files: