Removing the Word "by" in artist field

Sorry, I notice that I have not follow the good way to give ma question, so :

WordPress version: 3.6.1
Plugin version: latest pro
Link to my site: https://benbridgen.com/

I expected the plugin to do this:

I would like to have nothing at the left of the text field “artist” which is upper the track list

Instead it did this:
There is the wold “by”

Here’s what I’ve tried so far:
I have been looking in the code, but I did not find where it’s put

Thanks for your answer, the plugin just work great !