Without knowing the model number of your player it is difficult to answer your question.
Players which can be recharged typically do so through the USB port. When plugged into a charger or computer, this type device should have a LED illuminate or lightning bolt appear on the display to show it is charging.
If nothing happens when it is plugged in to a charger or computer, then it may only operate on AA or AAA batteries and should display something when it's time to change them.
Answers & Comments
Without knowing the model number of your player it is difficult to answer your question.
Players which can be recharged typically do so through the USB port. When plugged into a charger or computer, this type device should have a LED illuminate or lightning bolt appear on the display to show it is charging.
If nothing happens when it is plugged in to a charger or computer, then it may only operate on AA or AAA batteries and should display something when it's time to change them.