This is what the book shows for seats with the seat belt in the seat back. I assume it'd be the same if you have a different type seat though.

<table border="0" cellpadding="1" cellspacing="10"><tbody><tr><td valign="top">1</td> <td valign="top">Pull the head restraint out to end of travel. Press release button, pull head restraint rod past its stop position.</td> </tr> <tr><td valign="top">2</td> <td valign="top">Using a flat-bladed screwdriver, press the release tab on the second head restraint rod guide and pull head restraint free of seat back.</td></tr></tbody></table>