Hi, and sorry about any confusion!
HTML/CSS is integral to using PHP in web development, and mentioned as a prerequisite in the first video in the course:
You can take our html/css courses, and/or ask here too if you have any questions about it.
To answer your original question, you need to lower down, in the 2nd editable area after the
<ul> tag, put in
<li> tags. Here's what the first one will look like:
<li> Population: <?php echo $cities['tokyo']; ?> million</li>
Don't have any
echo statements in the top bit of PHP code either.
Please ask further if you have any other questions!