Post your code again, however before you hit "Submit" or "Reply" highlight your code and press the button called "Preformatted text" This will allow us to see your code.
(If you can't tell whether or not it worked look to the right of where you're typing and it should show you what we'll see.)
echo "My first line of PHP!";
Try again, however make sure you press the "Preformatted text" button after highlighting all of your code. You've got this!