I have the following SD card reader on the left side from Sparkfun. In the tutorial they have it connected directly into an Arduino Mini, which has BLK and GRN pins> I would like to connect it to an Arduino UNO. Where do I connect these pins or can I ignore them? Thanks for your help.

[![enter image description here][1]][1]

  [1]: https://i.sstatic.net/Le9YC.png