The module's main page lists all the known scheduled jobs, grouped by the user to run as. Some systems will have jobs that are part of the operating system, owned by users like root or sys. There may also be jobs created by users on your system using the crontab command, owned by the users who created them.
For example, if you chose 5 for the hour and tuesday for the day of the week then the command would be run every minute from 5:00am to 5:59am on tuesdays. Alternatively, if you chose 30 for the minute and 14 for the hour, then the command would be run every day at 2:30pm.
Once you have filled in the form, click on the Create button on the bottom on the page. The new job will take effect immediately.
To delete a job, click on the Delete button at the bottom of the job editing form. This will immediately delete the job without asking for confirmation.