You shouldn’t add any new HTML to the step. The example HTML in the instructions is just that, an example, not meant to be used in the solution.
Restart the step to get back the original HTML and formatting since formatting is very important for this step. Then, the only thing you should do is use your space bar to add two more spaces before the opening tag of each of the three child elements in main.
When one element is nested inside another that creates a parent/child relationship. The element on the outside is the parent and the element on the inside is the child:
<parent>
<child></child>
</parent>
So in this case the main element is the parent and the three elements inside of the main element, which are the h2, the comment, and the p are the children of main.