If you have Webmin installed on your system, point your favourite web browser at
https://localhost:10000/ and login as root.
click on the System tab and then the 'Scheduled Cron Jobs" option. A list will come up listing all the already defined cron jobs.
click the 'Create a new scheduled con job' located at the top or bottom of the listing.
Fill in the Username the script is to run as and in the command box type the full path to the script. Then set your schedule using the options underneath. To run a job hourly, in the 'When to execute' section click the 'Run on selected Schedule' and select Hourly from the drop down box. scroll down and click the Create (or save button if you open an existing job to edit) and you're all set.