To setup Cronjob login to your cpanel.
Search for : Cron Jobs.
By clicking Cron Jobs link you will get the cron jobs setting page.
Select the period from common setting for example (Twice Per Day) which means that the cron job will work two times every day.
Then Insert the Command that is responsible for Importing news from feed sources.
php -q /home/YOUR-ACCOUNT/cron.php
YOUR-ACCOUNT with yours.
You can find it in cpanel at the lest sidebar (as the following image) Where the account name is the underlined.