Tap the iPod icon on the iPhones home screen.
Select the Playlists tab at the bottom of the screen.
Select On-The-Go.
If youve never created an On-The-Go playlist before, a list of all the songs on your iPhone will automatically pop up along with blue and white plus sign icon.
Tap the plus sign or anywhere within the box around each track to add a song to your list.
Youre not limited to adding songs. You can add podcasts, audiobooks, and even videos (although videos wont play if the phone is in sleep mode). Simply tap any of the tabs at the bottom of the screen to browse through your media and add it to the list.
If you accidentally add the wrong song, you can delete the song later in edit mode, but for now, youre stuck adding items to your list.
When you are finished creating your On-The-Go playlist, hit the Done button in the upper right corner.