How to make Compressor to use Xgrid

I have 2 iMAC with Leopard 10.5.6 installed on them.
I decided to make a Xgrid group to compress my video using Compressor.
I have configured one of them become the controller (iMAC C), and the other become the agent (iMAC A) by using some terminal config line (I found them on the internet)
Then I installed Server Admin Tools 10.5 on iMAC A, using Xgrid admin, login to the controller and see the both agents: iMAC A and iMAC C (iMAC C is both controllers and agent)
I check the group by add jobs using Gridstuffer and everything is ok.
But when I use Compressor on iMAC C, I don't know how to use the Xgrid (how to tell Compressor to submit job to Xgrid group). Everything I've done is useless now
Please help me to figure out. I don't want to waste a whole afternoon for nothing

 

Please, help me!

 

Thank you! Could you tell me how to setup Qmaster on my iMACs to do so?
Or send me a link containing instruction?