Come2Daddy - depending on the HTML/PHP editor you are using, the find-function is likely not searching the entire document from top down with each find request. And that can easily throw a person off.
In otherwords, you likely were able to complete Step 1, but once you got to Step 2, it couldn't find the code you entered in.
If that is the case, try going thru it again, but after you complete Step 1, scroll back up to the very top and physically click on the first line of the file. Once you see the cursor flashing there, try the search for the code in Step 2 again.
I'm running 3.7.3 forums (few of them XD) and this code works as a brand new install (not sure how I overlooked it prior).
Thanks Paul M

Another great job.