Gerbil you can also add the script to your mission by- after the copy operation Ataros speaks of above, if your FMB is running and you are looking at your mission, you can go to the Script tab and paste the text in there to create the script. This can be easier than finding the mission on your computer
(I tell you this to point out that CoD is Windows-friendly, standard Windows operations like Ctrl + v work)
Ming