Click the Infini-Egg to break it. Click on the shop to activate it, then click on the upgrades to buy them, and don't worry, THE PRICES DON'T GO UP. And the thing at the end of what just said TOTALLY wasn't trying to convince you not to raise your prices if you're a business. You can also use space with Makey Makey to break the Infini-Egg and open and use shop (Left for BPC, Right for BPS, and W for opening.) Oh, and if it seems slow, you can use https://turbowarp.org/948614101 to make it run faster.
thanks to @yadayadayadagoodbye and @gdfsgdfsgdfg for telling me how to add a shop. #game BPC stands for: Breaks Per Click. And BPS stands for: Breaks Per Second. Psgaorks.