How to broadcast microphone sound with reverb with ur22 mkII

Hi. I own an UR22 mkII interface with loopback function, and wish to stream using BUTT software, Icecast and Cubase. I’m not really sure how loopback works. From the schemes, the signal from the microphone is mixed with the signal from the daw and broadcasted together. I want to broadcast only the sound from the DAW, that applies a reverb effect to the monitored microphone. How to do that ?