First you have to create a new map. Press enter, write "*new" (without quotes), then press enter again.
Wow really, the manual says you have to write "!" Ok this fixed the issue. But I had to do *new {mapname}
English manual is wrong. Check out the Russian one.Also expect a lot of frustration. The tool is very primitive.
Is the code of the mapper available?
Is there any way to add a custom .ogg track to a map, for example like water works.