1. Prepare an empty memory card: Make sure you have a memory card that meets the requirements of the device and insert it into your device. You can determine the correct memory card type and slot location by reading the instruction manual of the device or looking for the corresponding card slot on the device.

2. Connect the device to the computer: Connect the device to the computer through a USB cable. So you can manage the files and folders of the device through the computer.

3. Select music file: open the music folder or music management software on the computer. Browse your music library and select music files to download to the memory card.

4. Copy Music File: Select the music file to download, right-click and select Copy. Then in the memory card folder of the device, right-click and select Paste. This will copy the music files from the computer to the memory card.

5. Complete copying: Wait for the copying process to be completed to ensure that the file is successfully copied to the memory card. Then disconnect the device from the computer.