Found under: Settings > Set Actions > Bible > Download
It is possible to add scripture to set files as custom slides. You can either add scripture from an online source (Bible Gateway), or if you don't have internet access, you may wish to download Bible translations beforehand so that you can use them offline.
OpenSongApp (and OpenSong) both understand xml or xmm Bible files. Zefania bible files are also compatible.
By default, the app will list some of the common OpenSong XML bible files available. If you chose to download them, they will be stored in your OpenSong/Scripture/ folder and will be available for offline searches.
You can also manually download bible files from the OpenSong or Zefania website and extract the xml/xmm files into the OpenSong/Scripture folder.