For the CLD 2 cm × 8 cm board. Holes are named by what's printed on it: a letter for the row (A, B, C… down the long side) and a number for the column (01 to 06 across). B6 means row B, column 06. Yellow rings in each picture are that step's holes.
You need: the board, a header pin strip, one 10k resistor, solder, 5 female-to-female jumpers, 3 male-to-female jumpers, 3 gator clips, 3 sticker electrodes.