[Zope] Can't get my crontab -e working

This is what I did: crontab -e */2 * * * * wget http://path/to/my/pythonscript This does not work. I am probably missing something like a username or password in this line but what username do I need. Is it the main user in the acl_users, manager, of my zope or do I use the username=zope or I placed a local role to that script with manager privileges do I use that username? Thanks, Laura