RSS Feed Error

Does anyone know how I can change the RSS feed URL?

The feed (link) is missing a slash at the end and therefore I get a 404 error when I click on the feed title.

You can see that the url is wrong when you open the feed: http://www.artrose-blog.nl/zorg-zoeken/feed

http://www.artrose-blog.nl/zorg-zoeken (bad)
http://www.artrose-blog.nl/zorg-zoeken/ (good)

Can someone please help me?

Ps I use DirectoryPress from premiumpres