You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
Since I learned the hard way since nobody answered you - they are a PUSH on cap. Take two little screwdrivers - wrap in tape first and gently pry them off.
You can get a $6.99 tweezer to pull the caps out or you can buy a $6.99 whole set of tweezer and 20 caps for Model 3 (which should work for all S, X, and 3 since they all have the same 21mm nuts).
You can also use a long nose plier. I would avoid using a flat head screwdrivers because it might scratch the shiny cap.
Since I learned the hard way since nobody answered you - they are a PUSH on cap. Take two little screwdrivers - wrap in tape first and gently pry them off.