I need help with the caster system.

This is a question regarding the caster system made by vexorian.

Nice system by the way, anyways, I've been trying to implement the caster system but I'm pretty much stuck at this point, whenever I click the maps name in the trigger editor to look for the custom script I find nothing but it displays the text of the previous trigger I viewed.

For example, I click on the readme, when I click the custom script, what I see is the readme and nothing else. As instructed I was to copy from the //Start to the End// But I can't find the custom script to begin with.

Help? And thanks in advance!