single player world into a multiplayer world?

[ForsakenOne]

How can i change my single player world to a mulitplayer world my friend is trying to join my world but dont know how to do it. I am playing on FTB academy. Please help

 

[vlnxnet]

It could be said that it was not possible, just the world played alone

 

[DarkfireBiggs]

Have you tried copying the instance save of the world into your server world save?