Mod Editor Error

[ThinkInvisible]

If I go to my friend's server(i have SA) and press f11 for mission editor, it says i have to load a mission. I tried loading a map. Please help,
ThinkInvisible-Now you see me, now you... Hey, where'd i go?

[Ad Bot]

[KoopaScooper]

You must start a game of your own. You can go Single-Player/LAN, if you don't want idiots complaining.