Simply start the game, go to leader mode.

CPS = Clicks per second (passive, time goes by)
CPC = Clicks per click (active, you clicking your mouse)
these are taken from my own assumptions, but they make the most sense

All you need to do is get upgrades on the right side of your screen - the costs will increase each time you get one, and then reach 10,000,000 score in the top left of your screen.
What I did is got around 5,000 CPS and upgraded my CPC to around 10k and just spam clicked. It took me so little time once I understood.