YllluKids LED Roller Skate Shoes with Single Wheel Light up Roller Shoes Gift for Girls Boys Children

I just got the shoes for my daughter and I cannot for the life of me find the switch or the connection to charge them. Can someone please let me know?

How do you install the wheel on these heeley shoes

Can you put the toe wheel in and leave the heel wheel out at the same time?

How or where can i get another twin usb charger?