broadcasting to radio.co

hi
i have the hercules impulse 500 - ive been trying to broadcast live to radio.co - i have serato pro and butt on my macbook pro - but i cant connect to butt.

i was told by mate to download and use loopback but i still can get the controller to send music and microphone to butt to radio.co

the set up i thought would work is serato -> loopback -> butt -> radio,co (but i cant turn off the internal mic on the mac and i cant get music from the conroller)

maybe i need to get an external mixer like the behringer so i go serato -> mixer -> butt -> radio.co

any help would be appreciated as i am pulling my hair out 

thanks