Have you definitely read https://www.warzone.com/wiki/Map_Making
and looked at all the links provided there?
In the wiki it says the map designer.. Can someone point me to this tool please?
What exactly do you you mean by the map designer? Are you referring to the program used to create the SVG (commonly Inkscape) or the Warzone editor?
Inkscape is used to create the map design (territories, bonus boxes, artwork, etc.) and the Warzone editor is used to do the rest (set the territory connections, set territory names, select which territories are in which bonus, distribution settings etc.).