Attaching Spades to Onkyo TX-NR807?

Bit of an odd question - but is it possible to use spades with this receiver... I can't seem to see how they would attach, I bought a set of these, and it seems I can only use them speaker side.
http://www.nakamichiplug.com/product-0515F08.html

If it can't be done - I'm going to order a set of these for receiver side:
http://www.nakamichiplug.com/product-0575G08.html