You need to rely on the author to create a game with the map on Battle.net. If you have not downloaded the map from Battle.net, then there is no other way of creating a game with the map on your own.
By the way, you can play my map Weapon Ace. It's about playing with hero characters with special abilities. Check it out, I always post it up on Battle.net, just in case you don't know how to get there, go to join game then click custom in the drop-down box and finally enter weapon ace in the search box.
I have a map that needs testing, but I doubt it has any issues. Maybe just to improve it. Anyways, the map's name is Weapon Ace, and I have it in the Custom game area of Battle.net. I can't make it on Map Night because I don't have my own laptop, the only other computer I have can't play SC2. I would appreciate it if I can get some form of feedback on the map.