1. Connect the USB cable to the MP3 player's charging port.
2. Connect the other end of the USB cable to a USB port on your computer or a USB wall adapter.
3. The MP3 player will begin charging. The charging indicator light on the player will usually turn on or change color to indicate that it is charging.
4. Leave the MP3 player connected to the charger until the battery is fully charged. Charging times can vary depending on the size of the battery and the charger used.
It's important to use the original charging cable or a compatible cable provided by the manufacturer to avoid any damage to the MP3 player. You should also avoid charging the player for an extended period beyond when it has reached a full charge.