Okay, thank you. I really appreciate your help.
Running yarnspin.exe from the command line interface gives the following error "No yarnspin.dat game data can be loaded."
Here's the script I made...
title: My First Yarn
author: Your Name
start: my_location
=== my_location ===
img: room.png
txt: You are standing in a small room. There is a person here, it's Carol.
opt: Talk to Carol
act: my_dialog
=== carol ===
name: Carol the Neighbor
short: Carol
face: carol.png
=== my_dialog ===
carol: Hello! Welcome to my humble abode.
player: Hi. Thanks for having me.
say: Say goodbye and leave.
act: end_conversation
=== end_conversation ===
carol: Goodbye! Have a great day!
act: my_location