I don't use Zoom, but I found this information on setting up an interface for use with Zoom.
Important: As Zoom does not support multi-channel ASIO driver types, it will only be able to receive audio from the first two inputs of an audio device, so you will need to ensure that you connect your microphone/instrument to Input 1 or 2.
If that's true, you'll probably need to use an external mic into the first inputs.