I don't know my RSS feed URL

Your feed url is https://eveofreduction.com/feed/

When I click on that I get this message ” This XML file does not appear to have any style information associated with it. The document tree is shown below.”
Followed by a page of code.
What does this mean?

Thank you!

That message is correct and is being shown in Chrome because that browser does not have a native RSS reader. RSS feeds are really not meant to be read via a web browser but via a dedicated RSS reader.

I thought if I clicked my RSS button it would take me to a subscribe page?