You're in luck with this particular card because it does have a line level input. You will need a 3.5mm to RCA cable such as this one:
https://www.ebay.com/itm/AudioQuest-Golden-Gate-3-5mm-Male-to-RCA-Male-Cable-6-56-ft-2m/351899557897...
Or a cheaper one if you want:
https://www.ebay.com/itm/3-5mm-Audio-to-2-RCA-Cable-1-8-Stereo-Male-to-2-RCA-Male-Y-Splitter-Aux-LOT...
https://www.ebay.com/itm/AudioQuest-Golden-Gate-3-5mm-Male-to-RCA-Male-Cable-6-56-ft-2m/351899557897...
Or a cheaper one if you want:
https://www.ebay.com/itm/3-5mm-Audio-to-2-RCA-Cable-1-8-Stereo-Male-to-2-RCA-Male-Y-Splitter-Aux-LOT...