[kbs666]

Just do what you did for the humans article.

Before you finish editing you need to do one additional thing, attach it under the human article. There are a number of ways to do this. On the right hand side of the article that needs to be under the other you should see something called "Containing Article" and at present the words -No Container-. Click the plus sign by Containing Article and you can select any article to contain it, have the current one be under it in the hierarchy. Select your article on humans and you should be set.