Len,
You did the common 'try to work it out before reading up about it' and it didn't work. Where did you try to look it up in the manual? It actually explains it reasonably well.
Put simply, you have to have the flash on the hotshoe, switching the flash onto the wireless 'on' mode (middle click on the AF360 power switch). Then switch the camera to wireless flash mode (via the Fn button). Once you have confirmed the channel setting (usually CH 1 on the LCD), set the mode you want (start with P-TTL for ease of testing), then half-press the shutter button to 'sync' the flash with the camera - the camera now knows to communicate with the flash wirelessly.
Now detach the flash and pop up your on-camera flash. Set the flash away from the camera with the IR sensor facing the on-camera flash and fire aaway. Have an eye on the 360 flash while shooting to confirm it is firing when the shutter is released.
Happy wireless flashing.