Yes that is correct:

root@lamp1:~# cd /etc/apache2/
root@lamp1:/etc/apache2#

Are you running the provided LAMP image we have under "Applications"?

No, I built it as per the tutorial.
Should I rebuild the droplet using the DO LAMP image?
I haven't done that much on the droplet so far, other than install WordPress and phpMyAdmin

The default location is /etc/apache2 but you can check through the install you ran to see if it was placed elsewhere, the second most common location would be /usr/local/apache2

Otherwise you can spin up the LAMP image under Applications which will give you a bit of a head start on some of the necessary packages.