I understand it now! it only took folling around with it for liek an hour,THE ONLY problem im having is, when everyone spawns, they fall through the level, im sure this this is a simple mistake and it can be easily corrected, plz tell me how and it will be greatly appreciated. TY

Have you made sure to compile the map before playing it?

i dunno, basiucly what i did, was save it to my desktop and just put it in map folder, plz explain what i need 2 do, i wanna put out my new map, its a d-day map

You need to compile your map, for starters. You'd know if you compiled it or not. Don't just save the map to a random place. After that, you should read the guide for releasing your map.