Click and hold on any of the beads above and move a copy of the bead to the black string below. Do the same to another bead. Make as many beads as you like. Once you have made a bead you can change where it is on the black string simply by clicking and holding, then moving the curser and bead to a new position and then release the button on the mouse.
Clicking on "Reload" or "Refreash" resets the game.