How do i get this to work ? I open scarface map with the nZombies mode , and there are no spawn point marks etc

When you load into the map and it shows the nzombies HUD where it says "READY", "SPECTATE", "CREATIVE MODE", etc, there should be a settings button on the top right of the screen showing a gear symbol, click onto that then click on "Load Map Config". Look for Scarface Workshop item and load config, then ready up by pressing "READY"