Need help using Stream Controller and Audio Mixer as Soundboard

Need Help! Anyone with a Razer Stream Controller and Audio Mixer using them as a soundboard? I can't seem to get the routing correctly no matter what I do. I'm using a Shure Mic and Headset. I have my mic plug in with an XLR cable and headset with the 3.5 jack into the mixer. Synapse is registering them both. I can hear my own mics feedback in my headset. I don't know how to set it up to where I don't hear my own mic but I can also transmit my soundboard into discord/games.