Unpack one 18” long SATA 3 Cable SC-SATA3-18-LL-BK
Label both ends like this.
Keep in mind that if you stagger the labels it will be easier to read them in a situation where 2 cables have to be stacked vertically as in the case of the SATA Data Ports 1 and 2 on the Motherboard.
Connect the Cable labeled 850 EVO to the bottom SATA Data Port of Group A on the Motherboard. This is SATA Data Port #2.
Connect the other end to the SATA Data Port of the Samsung 850 EVO SSD.
