I must be misunderstanding you, 'cause this seems too obvious:
Repeat a song: hit the backbutton, which will take you to the start of the current song.
Skip a song: hit the forward button to skip to the next track.
ok i got the skip song part...i mean can the iPod Shuffle automatically repeats songs? is there any button to do so? or i need to keep pressing the back button for it to repeat?