You can reach the High Mage Rebecca through support tickets, they'll enable the map editor (which is what 'Create' stood for) for you. ;P
Reason it's not implemented was that it didn't seem like a good idea to have people find an NPC in-game to do something outside the game. If someone wanted to make their own maps, they've always asked in one way or another, so that's how it's generally done. ;P
I'll put a more detailed explanation there for the next client update.