sorry, Carol, not being awkward, just trying to get the whole picture before an answer can be formulated. If you had a cable just follow Gunnar's instructions and you will be fine.

assuming you are trying to make a recording of your playing in order to make a cd etc you need a stereo audio cable from the 2 line out sockets (left and right) on the piano to the audio line in socket on your soundcard.

The piano sockets may need 2 6.3mm mono jack plugs, and the soundcard may need a 3.5mm stereo jack plug, or maybe 2 phono plugs if an expensive sound card, you have to check exactly what your equipment needs. You need a screened audio cable with the correct plugs and/or adaptors.

Send me a percentage when you sell a million