Add a Map Exit actor to the first map you want to link. The Map Exit actor is found under the Special Actor tab. In order for the Map Exit to work the player must touch it, so make sure that it's somewhere the player can reach.
Now, open the properties of the Map Exit actor and go to the Teleporter tab.
Click the tab that says "URL". This is were you type the name of the map you want the player to teleport to. The map we want the player to teleport to is "Transport2", so type Transport2# into the URL field. The hash-tag is required at the end of whatever level you're linking too. Be sure to substitute the Transport2 map name for whatever map you're linking too.
If you linked the maps correctly, then you should teleport when you reach the area you put the Map Exit actor at. You also need no special actor teleport in the second level, just a player spawn.
