Problem with FeedWordPress RSS Plugin

Hi Folks:

I’ve been using FeedWordPress for a couple of weeks now… its a very nice RSS agregator.

The only issue I currently have is that if you set it to automatically update itself (that is the rss feed/posts), it sometimes will take a significant amount of time to load the blog page if its been awhile since someone visited the page (i.e. the plugin only updates after the time set has expired AND someone visits the page).

The author has a way he says that it can be updated using a cron tab. Here is the code he gives:
*/15 * * * * curl --silent https://www.zyx.com/blog/?update_feedwordpress=1

I have tried for a couple of hours different variations and cant get it to work. My blog is at (example): https://www.domain.com/blog/

My server uses cPanel 11. The main error I get is: “No such file or directory”

I have tried it with and without parenthesis, without curl, with index.php before the “?update_feedwordpress=1” etc.

Thanks for any help.

Matthew