How do I remove factory songs from Sansa Shaker

I am using a mac and have managed to convert my itunes songs to MP3 and have successfully loaded them onto the SD card, but I can’t get rid of the songs that were on the thing from the factory. I have removed them from the SD card, but they still show up when I play it. Help!!!

My little brother had the same problem with his. What i ended up doing was plugging in the Shaker without the SD card in it, and manual deleting. Highlight the songs with the cursor box, then press the delete button on the keyboard. 

Not sure if this will work because I’m a PC. 

I had the same problem on my Mac, too. . .