This a great all-round board for interfacing to external electronic devices with excellent power options.
Additional steps to get working
You do have to follow these 4Tronix instructions as well to enable I2C
(Or alternatively use the built-in tool, raspi-config, and just follow the Step 1 instructions from here)
To use a PiConZero in ScratchGPIO, make a variable called AddOn and set its value to PiConZero when green flag is pressed (All ScratchGPIO is case-insensitive but I use capitals for readability)
As you can see from the examples on the left you can control the motors, set the outputs on or off, use the outputs as servo controls and even use power commands to vary their value using PWM.
Output 5 has an extra use to control Neopixels (WS2812 type RGB LEDS) The full range of ScratchGPIO Neopixel syntax is available
The inputs can be used detect high or low values (they default to being high so that simply connecting the appropriate S pin to gnd (G Pin) will change it from a 1 to a 0
The inputs can also be changed to read analog voltages from 0 to 3.3V or read temperatures from DS18B20 sensors