Well, to explain it a little bit....
When you're in the editor, 'makin yo maps', to call the script, you simply make an event, and use the "script" command. It will open a small textbox. Paste the script call in, and substitute the information you need. so you would put in, w=[1] to use the first weapon in your database, or change that to whatever number you want, as log as it's a valid weapon in your database.. That should at least get you started..