Goto the recipes folder copy ExtRadio.js file now paste in same dir (recipes) call it ExtRadioIn.js
now goto your MM config and find recipes in GA part of config add ExtRadioIn.js like this.
recipes: ["ExtSpotify.js", "ExtGPhotos.js", "with-BackgroundStatus.js", "ExtRadioIn.js"],
Now I send you a small guide via chat this is for Australia radio but it is the same just donât follow adding (download) the ExtRadioAU.js and icons this guild may help.
if still not working can you post your ExtRadioIn.js file here i will check after work.