Use DAC SPDIF input 2-pin with Coaxial

Can anyone explain how you can use the SPDIF 2-pin header on a DAC HAT as input using Volumio?

Specifically, how do you connect an input - it could be a Coaxial Cable from a player or Tv to the DAC.

I have the Audiophonics 9038 DAC HAT using RP4.

See image of SPDIF 2-pin here