Simple audio player help please, I am a newbie

I am new to Word Press. I upload sermons in m4a format and I’m getting an error message about short code. I have no clue about this as I just upload and fill in the information. I don’t do any coding. Also, what appears is a globe that when clicked the sermon downloads to my pc, but I would like a player that will just play the sermon online. How can I do this? I’m a bit afraid of messing up the church’s website so if someone is willing to walk me through the steps, I would appreciate it.
Thank you.