For Drupal 7 you have to add a security string as specified in a Drupal 7 administration page.
Go to Administration › Reports › Status report and look for a string similar to the following example. Use the full string in the cPanel cron command box as the cron.php's url.
Drupal 7 also includes a reworked Poormanscron at Administration › Configuration › System › Cron. Poormanscron only works when people visit your Web. This is applicable for those sites which don't have enough opportunity to setup cron.