well, regardless of which program we are talking about, this screenshot will help.
first you would want to copy the mml data. Search "BGM" + the number you are looking for. Copy from the label to "DATA 0". Past it in your program. Then when you wish to play the song, assign the bgm an id with BGMSET as shown, then play it. Hope this helps!
0そうだね プレイ済み