How do I pull chip select pin up and down, when I have CAN shield and Newhaven Display 4.3CTP-SHIELD-N share the same chip select pin(10)?
You will have to use a different chip select pin for one of the shields.  You should do it to the display shield since that goes on top. 


Change the code to use a different chip select pin for the display shield
Break or cut off pin 10 from the display shield, and solder a wire from where pin 10 was to your newly chosen chip select pin.