The whole tool is quite simple to use. On a top left side you see a navigation, you can also drag the map by holding left button of mouse and move. To zoom map is exactly same, you can use proper buttons or a mouse wheel. On top right side you have a special set of tools. By them you can draw on map lines, points or figures. The "+" gives you a control over layers. You can hide your drawings or other things which you would not like to see in the moment.
The buttons, bottom of the tool set, are responsible to change floors. At the end you can easily save your map and use it anywhere on forum/portal. The bbcode [.mapper]code[/mapper] (without dot) works on whole site.