Hey, you need to work on shortening your questions and making them more to the point, I have this problem too.
As I understand it you want to play your custom sound file as the music for your map? I've never actually messed with the game music but I tested some stuff and think I have what you want. The trigger is pretty simple, it's the fact you need to set your imported sound up as a "sound" AND a "soundtrack" in the map's data that makes it a little tricky.
Step 1 - Import your sound file, I see you have this done already
Step 2 - Go into the data editor, open the sounds tab, find a music sound and duplicate it, go to the sound asset field and change it to your imported sound
Step 3 - Open a sound track tab in the data editor, duplicate a music soundtrack, go into the cues field, under master layer change the sound to the sound you just made, other layers don't matter unless you want to have multiple sounds on this soundtrack
Step 4 - Open the trigger editor, make a new trigger with the action Play Soundtrack. Change the soundtrack ID to the track you just created. I'd set make default to Do as well, rest you can leave as is. Only thing remaining is setting the event for the trigger, guessing you want this as map init.
That should work, people with music turned off will not hear it of course. You can mess around with the settings in the sound to change how it sounds.
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While I have such information from one assistant at the Starcraft 2 forum, which helped me with advice - it's [KopBan] Likkan [KopBan] Koprulu Bandicoots.
Its version :
Had to do some digging, first time ive imported assets myself but I belive I got it. According to SC2Mapster you can only import MP3 or OGG audio files. If you already know how to add audio files scroll to the bottom of this. Firstly, in the editor on the top bar press the Import button (alternatively click F9 on keyboard). In the empty white list right click then click Import Files. Click the Browse option then find the location of the Folder where the audio files are in, select it and press OK. All files in the folder is selected by default, click the checkmark on the folder to deselect all if you got got too many to bother unchecking then select the respective audio file or files you want to import then press OK. Then, save the map. The entire custom SC2 map file itself. I do not know why this step is necessary but its part of the process. Then go into the Data section (F7 alternatively) and amongst the various types of files (model, units, actors, abilities etc) click Sound. It likely will not be there by default so click the green + sign to the right of the categories and in Art and Sound click Sounds. Now go in the Search section below the categories then type in the name of the file you want to create (its not there yet, this is just to clear the list). Right click the now empty list then click Add Sound, type in the name of your audio file, then underneath in the ID tab click Suggest (this is to make search options easier) and click the OK button. Your file is now fully imported and useable within the Starcraft 2 editor of that respective map. Now go into Triggers (alternatively F6) and create an new Trigger Action, simply search for Music and you should have the option right there with information about it in the info box right below it.