Is this the manual for your receiver?

http://www.pioneerelectronics.com/vgn/im...nstructions.pdf

It looks like it has speaker connection instructions starting at about page 17. These do include diagrams and the text confirms that for a 5.1 configuration you should connect your two new surround speakers as left and right surrounds. If you ever want to add one or two more speakers as rear surrounds there are instructions with diagrams for that too!