You should uninstall Voxal, restart the PC, reinstall Voxal, restart again to setup the audio drivers correctly, then connect your microphone, make sure Windows detects it correctly.
Go to "Options > Preview Audio" and make sure the playback and recording devices are correctly selected, under "Preview Mode" select "Listen to the voice effect as you speak" and click "OK"
Select a voice and click "Preview" you should be able to speak into the microphone and listen to your modified voice while you speak.