ShortcutCTRL + SHIFT + S = Save the currently tile (F7 show them)CTRL + S = Save the whole changed contentSaved content will saved in "$Folder/World/Map/Mapname/"After save the content, you've to export them into a .MPQ patch which includes the stuff, you've created. Once you had done this, move the MPQ into the "$Folder/Data/" and start WoW.
The next setting ProjectPath gives you the possibility of setting the path where noggit will save files and load the files from a project folder. If this path is not set, noggit will save and load this stuff in the WoW client folder.