Click on the apple to gain apple coins. Clicking on the buttons that say Ap/s or Ap/c, will increase apple coins per second or apple coins per click, if you have enough apple coins for the upgrade. The price multiplayers for each upgrade show how much each upgrade currently costs.
I have to give a huge thanks to @Jbear_ he gave me a lot of help in making this game. 1.0: Release 1.01 you can actually see what the upgrades cost 1.02 Different background 1.03 now keeps track of the world record amount of clicks 1.04 credit to @Jbear_ for showing me how to fix the problem of the game not taking away the correct amount of apple coins.