Okay. Basically speaking, the Heisenberg Uncertainty principle states that you cannot know the exact position of something and the exact momentum of something because the act of observing it causes it to change position and/or momentum. On large objects, this really isn't a big deal because the uncertainty is vanishingly small. In the calculation you showed in your original post, you calculate the uncertainty in the position of the football (which would be in meters). So you showed that in observing a football, you are changing its position by 5.3 x 10-37 meters. That value is incredibly small because the size and mass of the football is huge compared to its wavelength. Now when we get onto the scale of an electron, however, the alteration of the electron's position due to our observation is HUGE because of how tiny the electron is. If you re-do those calculations with the wavelength and mass of an electron, your calculated uncertainty is going to be MUCH larger in comparison to the electron.