To disable the internal WordPress cron job system, open the wp-config.php file in the root of your WordPress installation and locate the following line:
define('DB_COLLATE', ''); - Right under it, add the following code: define('DISABLE_WP_CRON', true);
If you want to enable the WordPress cron, you will need to change it to:
define('DISABLE_WP_CRON', false);
Note: You can modify the wp-config.php file via FTP, SSH or File Manager in cPanel.