How do I set my NS7II as default sound card to broardcast online with my NS7II?

someone please help, just bought ns7 2, loaded all drivers, all lights up, i see sound on serato, but nothing on master volume on serato, i have it hooked via rca to 3.5 jack to mic on my computer (i broadcast online so i need sound through computer) do i need another sound card?
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