Also you can access your server via SSH, type in the crontab -e command and edit your existing Cron command by adding a specific amount of asterisks before your Cron command. If you need Cron to be ran every minute, your command should look like the following one:
* * * * * wget http://yourwebsite.com/path/to/cron/run.php
Take some time reading about Cron Jobs at Google and don't hesitate to ask if you have any questions, Jake.