AGPtek M28 User Manual page 5

Choose from these menu, and click button to play the music.
start playing from where you left last time;
all your favorite songs can be added here.
Last played:
Create Playlist:
While it's on music playing interface, hold the button / to
Rewind/Forward
rewind/fast forward, short press to previous/next music file. Click
button for playing/pause.
While it's on music playing interface, click button M to access to
Submenu
the submenu.
The related list will show, including
"Home" , "Shuffle" , "Repeat" ,
"Bookmarks", "Play music from", "Equalizer", "Variable Speed
Playback" ,"Sleep timer" ,"Delete" "Add to playlist"and"Remove
from playlist".