The challenge doesnt ask you to add lines before and after the code, it just asked you to add two spaces to make sure the h2, comment and p start six spaces from the start of the line and not six lines.
An example of indentation:
<div>
<p>Some text</p>
</div>
This is a p element indented two spaces from the div.
So you will have to make sure the h2, the comment and p are exactly six spaces from the start of the line.
I would recommend you to click Restart Step and add two spaces for the h2, comment and the p OR select the h2, comment and p and press the tab key once.