Scooter, bike USB charging (Siggerjack) installation for anyone

Once after riding a 50-cc scooter called Street Magic,
I bought 125cc Daelim Dart125.
It's not a good scooter, but it's a good one.
I'm going to do this and that.
This time, it's really easy to install USB charging!
You can do it all if you do it.