Connect the USB C cable on the back of the Rodecaster to your laptop.
Set your laptop's input/output device to "Rodecaster Multichannel" to record the 4 microphone tracks separately, or to "Rodecaster Stereo" to record a single stereo track.
Open your recording software, choose the same audio input/output settings in the preferences.
Configure as many tracks as you need [up to 4 mono tracks for "Multichannel" mode or 1 stereo track for "Stereo" mode] then arm them for recording.
Press record and speak into each microphone to test if the audio passes.