You may refer to the datasheet http://www.szledcolor.com/download/SK6822%20LED.pdf
1. Float the Din1
2. Connect Din2 to your CPU GPIO pin
3. Connect the power and ground.
This part is cross part to WS2813 but WS2813 has integrated capacitor, much compact.
The protocol is similar to WS2812B, SK6812, WS2813. But beware the timing is slightly different. You can try FastLED library as it seems to support SK6822 already. I don't guarantee how well it works because I don't have actual part to test yet.