How to use MP3 in a Chevy Aveo?

I recently purchased a 2004 Chevy Aveo and I noticed it says MP3 on the stereo. However I can't find any auxiliary inputs/jacks. Is there something I'm not aware of? How can I connect my iPhone to it?

Using an MP3 CD
MP3 Format

This MP3 player will accept MP3 files that were recorded on an up to 700 MB CD-R CD. The files can be recorded with the following fixed bit rates: 32 kpbs, 40 kpbs, 56 kpbs, 64 kpbs, 80 kpbs, 96 kpbs, 112 kpbs, 128 kpbs, 160 kpbs, 192 kpbs, 224 kpbs, 256 kpbs, and 320 kpbs or a variable bit rate. Song title, artist name, and album will be available when recorded using ID3 tags versions 1 and 2.

The player will be able to read and play a maximum of 50 folders, 50 playlists, 10 sessions, and 255 files.

Order of Play

Tracks will be played in the following order:

•Play will begin from the first track in the first playlist and will continue sequentially through all tracks in each playlist. When the last track of the last playlist has been played, play will continue from the first track of the first playlist.
•If the CD does not contain any playlists, then play will begin from the first track under the root directory. When all tracks from the root directory have been played, play will continue from files according to their numerical listing. After playing the last track from the last folder, play will begin again at the first track of the first folder or root directory.
File System and Naming

The song name that will be displayed will be the song name that is contained in the ID3 tag. If the song name is not present in the ID3 tag, then the radio will display the file name without the extension (such as.mp3) as the track name.

Track names longer than 32 characters or 4 pages will be shortened. The display will not show parts of words on the last page of text and the extension of the filename will not be displayed.

You can access preprogrammed playlists which were created by WinAmp™, MusicMatch™, or Real Jukebox™ software, however, you will not have editing capability. These playlists will be treated as special folders containing compressed audio song files.

Playing an MP3

With the ignition on, insert a CD partway into the slot, label side up. The player will pull it in, Loading, then Filecheck, then MP3 will appear on the display. The CD should begin playing. You can insert a CD with the ignition off.

As each new track starts to play, F001, the track number, and the song name will appear on the display.

If you turn off the ignition or radio with a CD in the player, it will stay in the player. When you turn on the ignition or radio, the CD will start playing where it stopped, if it was the last selected audio source.

The CD player can play the smaller 3 inch (8 cm) single CDs with an adapter ring. Full-size CDs and the smaller CDs are loaded in the same manner.

If playing a CD-R the sound quality may be reduced due to CD-R quality, the method of recording, the quality of the music that has been recorded, and the way the CD-R has been handled. There may be an increase in skipping, difficulty in finding tracks, and/or difficulty in loading and ejecting. If these problems occur try a known good CD.

Do not add paper labels to CDs, they could get caught in the CD player.

If an error appears on the display, see "CD Messages" later in this section.

All of the CD functions work the same while playing an MP3, except for those listed here. See "Playing a CD" earlier for more information.

5 DN (Down)
Press this pushbutton to go to the previous directory.

6 UP
Press this pushbutton to go to the next directory.

TRACK (Previous/Next File)
Turn this knob one notch to go to the first track in the previous or to go to the next folder. The player will continue moving backward or forward through the CD with each turn of the knob.

DIR (Directory)
Press and release this button to repeat the tracks in the current directory. DIR will appear on the display.

Press and release this button twice to repeat the tracks in all of the directories. All will appear on the display.

Press and release this button again to turn off repeat play.