RSS Feed for Blog not Working

I set up a blog for my client and set up an “RSS-driven” blog post feed. It worked fine when it was connected to Feedburner, but my client wanted to remove feedburner (long story) and now Mailchimp does not sent it out automatically.

Mailchimp told me to ‘rebuild my feed’, but with no resource to learn from and I’m not finding help on an internet search or wp forums.

My experience is with working behind the scenes on wordpress a bit, and I come from an HTML/CSS hand-coding background. I am not a hard-core web developer, but somewhere between designer and developer. Hoping I can do this myself, but will hire a tech if I can’t get help here.

My client’s blog url is: https://www.karenoconnor.com/blog/ and I thought her feed was https://www.karenoconnor.com/blog/feed/, but that is not working for Mailchimp to pick up and send it out. (sorry if this is confusing – I’m trying to explain the best I can)

Can anyone help me with a resource that explains how to do this in plain English for someone not experienced with this. Is there a simple way to figure out what my feed is, or to ‘rebuild’ the feed, as Mailchimp suggests?

Thank you, in advance, for you help!