I had the exact same experience. I see this sort of issue commonly. Surprising companies don't just link you back to their homepage when they promote their product with a blog. Seems like an obvious thing to do.
It's a medium blog. They don't allow you to add external links anywhere outside of a post. I suppose you could create a new post, add links in that post, and then add that link to the nav of the blog.
Don't use medium for this purpose then, would be my answer. I also had an issue getting to the homepage. Obviously I managed to get there, but I almost didn't bother.
