Sorry guys I am a complete newbie starting off in this area, so please be gentle

I have recently purchased Myriad 4 running it on a Windows 10 PC - everything is great so far!
I have a USB mixer attached to the same PC as myriad runs on with a XML condenser microphone connected - everything fine so far.

I want to stream to my internet radio station site, however;

1) do I need a separate encoder to achieve this? I'm used to using SAM broadcaster which is all integrated.
2) I downloaded 'butt encoder' but it only appears to take my mic input and not the actual tracks - these are assigned to the Mixer's Speakers USB condec

If anyone can help, point me in the right direction or just give me some advice, it would be great - really want to use myriad in the future.

Thanks

WW