The position that your level is represented on the world map (by default, this is the Seven Lands of Teraknorn) is called a node. To place a level node:
(list=1)
() Open the world map from within MASCOT. Choose "Show World Map" from the World menu.
() Select "Place Map Node..." from the World menu. You will then be asked to assign your new node with a number. Although this does not have to be the same number as the level it represents, it is easier to understand when looking at the map (e.g. level 1 does not necessarily have to be represented by node 1).
(*) Click where you want the node to be placed.
(list=1)