How do I use Media Controlls in MCreator for a mod??

I am making a Mod, that Is a Media controlling mod (Controlls your Locally Running Spotify and should work with other Media Players also) with a GUI including Media Play/Pause, Next and Previous buttons, and I tryed to make them work, but it didn't work. I cant use Robot (Java thingy that lets you do things like that) in MCreator, But if there's any way to use it, I need to know it. 

So if anyone knows how i can do this, I would be grateful if you explain it.

Its a Hyperfocus Project, and my head is so fixed on that, that i already dreamed of it.

So thanks to all that try to help me!