If you have the right keyboard look at the bottom left ... between the Ctrl and Alt keys there is a key with a Windows logo on it. Press and hold. While holding it down press the letter e" key.
Alternatively, if you have an icon on your computer called "My computer", double click on that.
You are now in Windows Explorer.
I didn't mean open the script, I meant open the folder that contains the script. It's called something like mymission.abel and contains
mission.sqm
scud.sqs (we hope)
and possibly other files like briefing.html
(Sorry, I know I'm probably teaching my grandmother to suck eggs here, but there's no harm in covering every step.)
Now you can go back to my previous post and hopefully it will make more sense. When you created scud.sqs, what software did you use? Was it Notepad?