Before start, there is a basic tutorial for how to use skiiiD

https://hackaday.io/project/167458-getting-started-with-skiiid-editor

#1 Launch skiiiD and select New button

#2 Select ①Arduino Uno and then click ②OK button

*This is Tutorial, and we use Arduino UNO. Other boards(Mega, Nano) have same process.

#1 Click '+' (Add Component Button) to search and select the component.

#2 ① Type'Dot matrix' on the search bar or find Dot matrix module on the list.

#3 ②Select Dot matrix

#4 then you can see ③ pin indication. (You can configure it.)

*This module has 5 Pin to connect

skiiiD Editor automatically indicate pin setting *configuration available

[Default Pin Indication for Max7219 Dot Matrix Module] in case of Arduino UNO

VCC: 5V

GND: GND

DIN: 0

CS: 1

CLK: 2

#5 After configuring pins ④ click ADD buttonon the right below side

#6 ⑤Added Module has appeared on right panel

skiiiD Code is intuitive function-based codes. This is based on skiiiD libraries.

skiiiD auto-complete feature shows skiiiD codes

clear() - Turn off all Dot LEDs
on() - Turn on a specific coordinate of dot LED 
off() - Turn off a specific coordinate of dot LED
setBrightness() - Set a brightness of led light (0 ~ 9)
displayNumber() - Display a number
displayAlphabet() - Display an alphabet