I just bought mp3 music player and I have my key but I don't know where to activate the product.  I went to my wp admin page and then to mp3 player but there is NO 'License Key' section to enter my key.  Please help.

Max, thank you.  No, I actually just installed mp3 audio player from the plugins section inside wordpress and that's it.

I'll try to figure out where to get the pro addon plugin and how to install it.

Thanks!  Man I'm dumb.  A maroon even.

Ok, Now I've got the 2 zip files and I've just gone into my wp admin panel and to plugins and upload plugin and I chose the first zip file and told it to install and now I'm getting this.

The uploaded file exceeds the upload_max_filesize directive in php.ini.

So maybe I need to call my web host which is Linksky and ask them how to increase the upload size.  Or maybe I can edit  that php.ini file.  

Thank you Max!  I think I'm on the yellow brick road to success now.  Merry Christmas.