I'm not sure if you've already worked things out , but it's as easy as put the flash on the camera , switch it and the camera on .
Set the camera to wireless flash , on the Dynax 9 you slide the right hand switch below the back to the right .
On the Dynax 7 you turn the dial on the grip to "WL" .
The flash should automatically change mode to wireless .
Put the flash gun ( or flash gun's) where you want them , pop up the built in flash and shoot away .
Press the AEL button to check the sensor of the front of the flash is withing range/sight of the cameras flash , the flash gun will put out a brief strobe which doubles as a modeling light .
For a bit more information have a look on the two following websites .
http://www.friedmanarchives.com/flash.htm
http://www.mhohner.de/sony-minolta/flashcomp_setups.php#wireless