Open the save's .mis with notepad
Blockland\base\data\missions
and then change
new ScriptObject(MissionInfo) {
desc1 = "Author: Eric Hartman"; <- guess
descLines = "2";
previewImage = "base/data/missions/kitchen"; <- the loading image
desc0 = "Name: Kitchen"; <-map name
name = "Kitchen"; <- map name
saveName = "Kitchen"; <- folder it saves to
to whatever u want:D