Connect your Raspberry Pi to the SKR3 EZ by USB or UART cable. I used a UART cable so that is what I will be showing but I'll try to explain how to setup USB as well.

UART wiring

PA10 > GPIO15

PA9 > GPIO14

GND > GND

For USB ONLY connect a USB cable from the SKR3 EZ to the RPI and place a jumper on VUSB

Make sure the double throw switch is in the up position

Connect the RPI to it's 5v power supply and power it on. Do not power on the the 24v PSU