This step depends of the specific model of your soundcard:
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====HifiBerry DAC+ADC PRO====
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Connect the 2 x balanced input jack connectors to the audio-input header on the sound card using the 3x1 pin Dupont connectors as indicated in the image:
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[[File:dacplusadcpro-top-audio-in.jpg|600px]]
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I recommend you take a look at [https://www.hifiberry.com/docs/data-sheets/datasheet-dac-adc-pro Hifiberry DAC+ADC PRO specification].