This forum section is for discussions related to this site (bugs, errors, rules, sugestions and stuff).
This site is not Diablo III Warcraft (it does host it as a project though), so this is not the right place to get help with that project.
Please try in their offical forum section, or as a comment on the map (where this kind of problem belongs).
Basically, firstly put it in your warcraft 3 map folder where you can easilly access it in the custom game slection menu. Secondly make sure you are updated to the lattest patch from battlenet (which you should be). Finally select the map in the custom game option, and click start.