I have this LCD screen.
https://a.co/d/b3069VO
It is meant for the Arduino mega but I have the Uno R4 WiFi. I am just looking to show text on this display, but cannot figure out which pins are supposed to connect. The mega connects in a convenient sandwich way as seen on the Amazon picture, but the uno is not big enough. I have the example code that comes with the ILI9486 library, but the upload does not display anything because I cannot figure out how the uno and lcd are compatible.
A look in the questions and answers from the amazon.com page you linked to would have answered your question:
Q: Can the SPI serial interface be used to drive the lcd screen, or must the parallel interface (16 data pins) be used?
A: The SPI interface between the Mega and LCD shield is used for the SD card slot. The data sheet for the ILI9486 mentions using SPI, but those signals are not brought out on this shield.