To add a playable audiobook to a blogpost, you’ll need to embed a player that’s capable of playing an M4B or M4A file. We’re not familiar with Blogger’s options, so you may need to search around for something that can be embedded that’s made specifically for dealing with Audiobooks. Most steps covered online (like here:
http://www.danoah.com/how-to-embed-an-m ... ogger-post ), deal with embedding MP3 players but may would be worth checking out as a way of familiarizing yourself with the player-embedding process.