It looks like you were trying to say, how to get more THAN 3 apps on my home page, sarcasm? If not you may need to turn something off in Accessibility settings.
Anyway there are a couple of ways to get smaller icons. Changing the home screen grid size will change the app icon size. Going from a 4x6 layout to a 6x6 or 7x7. I'm pretty sure you can get more options for grid size using GoodLock HomeUp. As for the other way, I'm not 100% that this still works, but you used to be able to change the screen resolution and see some size bumps.