Mission Editor is not opening :P

[indyjones]

Hello.
I was trying to open Mission Editor (Yes I changed the Properties so it had "-mod editor").
But when I press F11 ingame, nothing happens.

[Ad Bot]

[Nitramtj]

You now have to use the Add-on version of the mission editor, which I'm not sure how to get myself. Badspot or someone else can probably clarify on that part.

[indyjones]

Well, could someone please link me the Mission Editor addon?
Very helpful :P