Automatic content from rss feeds – how to add?

I have had a site made for me that uses WordPress to provide some automatic update via rss feeds. I want to add another feed source but I am having difficulty getting it displayed – it doesn’t!

I have validated the link and added it as ‘contributor’ in wp-admin and an existing cronjob should update it, however I get nothing from what I have done.

I am very new to WordPress and wonder if anyone could take me simply through the steps of what else I would need to do to get the feed displayed at my site in the same way that the existing feeds do.

I hope I have explained okay and sorry if I’m asking too much, my level of WordPress experience is zero!

Thanks in advance.