CallMeCoffin

So I've gone after every old thread I can until I just had to post one of my own with my specific problem. I am new to coding so I went off of all the guides until I couldn't find any more and was stuck on an error. I doubt the error will help but it said and this is the exact: Script bon_recruit_units/open_dialog.sqf not found. Now I know you cant help me unless I tell you exactly what I did to get to this error. Can anyone give me detailed instructions on where to put what once I have his mod downloaded?!? PLEASE & THANK YOU SIDE NOTE: I know how to add a list of units that I want to spawn to the script so don't worry about that!

From the code that Celery posted where do I put that to include them. Which file, init, mission, description? I'm new to scripting.