You can download the manuals here:
http://www.asrock.com/MB/manual.asp?Model=AM2NF4G-SATA2
Location: front bottom, just behind the primary ATA connector. (Diagran on page 10, tag 14)
Page 20
Third and forth pins on the 4 pins side. (9 pins connector, a row of 4 and one row of 5)
Electro, May 2011