It's simple. You just can download my song in this pack (or another pack).
And put it in your projects, and write my itch.io profile link or Twitter link or SoundCloud link or my name 'Swngyill YOON' in somewhere (e.g. credits of the game or readme.txt etc.)
That is all.
If you notice to me what of my songs are used in your games, and some links of your game to download or play, I will be pleasure. (It will be updated in descriptions of my song in SoundCloud to introduce your game! e.g. you can check this page to what I'm going to)
If you'd like to question about of other things, you can mail to me or send DM to Twitter.