You'll need:

• All the former vinyl records with their cover that you want to use in your playlist 
• The corresponding mp3 files available on the SD card.

For the mp3 files, you can find the music on youtube and use MediaHuman YouTube to MP3 Converter for instance 

Now, for each element of your playlist follow those steps:

1. stick the RFID tag at the center of the vinyl record
2. put the vinyl record back into his cover
3. insert it into the slot-in player
4. the tag's ID will be displayed on the LCD screen, take note of this ID (eight characters)
5. rename the mp3 file on the SD card with the ID, don't change the .mp3 extension