With SetCronJob, set up cron jobs is very easy.
After activating your account, you will have two example cron jobs: cron job every day (named "once a day") and cron job every hour (named "every hour").
If you would like to set up your cron jobs to run every day or hour, simply click on its URL, then paste your URL into "URL to call" field, then click on Save button.
If you want to set up cron jobs to run periodically, click on "Create new cron jobs'" link, select an interval at the second rows, enter your URL, then click on Add button.
If you would like to create cron jobs with crontab syntax, click on CRONTAB link at bottom of Control Panel, then edit time fields as desired.
Hope it helps :)