How to charge the usb interface of 4gt Chunfeng?

there are two charging interfaces on the left and right sides of the instrument panel. One side is a USB interface, which can be charged by inserting a charger. Zhejiang Chunfeng Power Co., Ltd., with a registered capital of 149.832 million yuan, is located at No.116 Wuzhou Road, Yuhang Economic Development Zone, Linping District, Hangzhou, Zhejiang Province. Its business scope is general project: motorcycle spare parts manufacturing.