Oh I see. Are you suggesting that I jump some wires to the pins that may have been taken, but not used?
Yes, you should be able to use any of the pins that shield does not use. I would just double check the datasheet or whatever documentation Adafruit provided. I suspect they are the ones that are not marked on the shield and left blank. If there are no obvious traces going to those pins they are probably not touched by the shield.
Thanks for the replies.
Even if a pin is taken by the shield from Adafruit's touchscreen, couldn't I still jump that pin by connecting a wire to it? Or can you not make 2 connections to the same pin?
The reason for this is the touchscreen uses the V_in pin. If I want to apply an external voltage source, I would need to use that pin for the voltage source and for one of the touchscreen's respective pin. So basically, I need to make 2 connections (one from the touch screen and one from an external V source) to the same arduino V_in pin.