sorry for this post but I could not understand what changes I have to do at the ethernet shield.
I removed the pins 50,51,52,53 from the tft shield and unplugged the pins 10,11,12,13 of the ethernet shield.
on the code I enabled the sd on pin 53 and disabled pin 4.
unfortunately, however, I always have the inscription to insert the sd.
I can not understand how I can resolve this conflict