In general, as the docs you link to say:
content/about/index.md => yoursite.com/about/
We don’t know what’s wrong because we cannot see your site code. Please have a read about Requesting Help to see how to make it easier to get help here.
In the meantime, check
- that your page is not set to draft
- you have a
single.htmllayout somewhere - you don’t have any
disableKindsconfig