RSS feed

i am trying to claim my blog on bloglovin. I emailed them and was sent this:
In order for a blog to work with Bloglovin it requires a valid 2.0 RSS-feed. Without this feed Bloglovin will not be able to find the blog/retrieve the posts. Unfortunately there’s nothing we can do in this matter since the issue is on the blog. You will have to contact the blog portal that is hosting your blog in this matter.

If you already have an RSS-feed, please send me the address of it.

I used a validator and can see where the error in the feed is, how can I get to the code to fix this?