Follow basic set up instruction in the kit and found online in the Quick Start How-To

In sum:

Connect MaKey MaKey board via USB to laptop

Connect paintbrushes via white wires to audio pins on back of MaKey MaKey board (The Virtual Chamber Pentatonic Piano allows you to play 10 different piano notes, using w, a, s, d, f, left, up, right, down and space, so attach to pins and other control sections as needed)

Connect your self to ground (earth) - a ring works nicely

Note: attach alligator clips to brushes as high up on the ferrule as possible, to help keep clips dry and paint free.