Fast-forwarding and rewinding and skipping between music tracks and video chapters only works if the app you are using supports it. (For example, you can't skip back to a previous song in iTunes Radio, so you can't do it with your EarPods either. But you will be able to skip to the next song.)
Using Earphones During Video or Music Playback
To start or stop music or a video
Press the center button once to play or pause.
To skip to the next song or chapter
Press the center button twice quickly.
To fast-forward
Press the center button twice quickly and hold.
To go to the previous song or chapter
Press the center button three times quickly.
To rewind
Press the center button three times quickly and hold.
Using Earphones During Phone Calls
To answer or end a call
Press the center button once to answer or end your call
To decline incoming calls
Hold down the center button for about two seconds, then let go. When you let go, you will hear two beeps indicating that you successfully declined the call.
To place a call on hold when switching between calls
Press the center button once to switch to switch to an incoming or on-hold call. You current call will be put on hold. Press again to switch back.
To end a call when switching between calls
When ending a call and switching to an on-hold or incoming call, press and hold the center button for about two seconds. When you let go, you will hear two beeps indicating that you successfully ended the call you just left.