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You need to set the flash to slave and the same channel as the master. If the flash doesn't have this function it may be able to be fired optically. Set the master flash to low power and set the off camera flash to optical.
How to use the internal flash as a commander is in the manual from page 189. The manual is online.
There follow 10 pages about all different settings for the remote flash mode. I could not find how to use the internal flash as a commander and switch of the commander itself. On my Nikon, I can use the light as a commander and when the picture is made the build in flash does not fire.
You always see the internal flash fire, before the picture is made, because it has not only to tell each group what setting it should use, but it also has to trigger the external flash groups. If you want to use the flash as a commander while photographing persons, you can use a Infra Red filter (little one) in from of the internal flash, so the subjects won't close their eyes. Look for the Nikon SG-3IR filter. I think Canon must have filters like this.
No, the battery is the same as you use to make all the other pictures. To check if your flash really does not work, please put the camera in automatic (green camera symbol and hold your hand in front of the lens while pressing the shutter button (to make it look dark) The flash should pop up and should go off.
When you don't put the camera in auto, it expects you to tell if the flash should fire or not.
If your battery is bad, or almost empty, it can't charge the flash, so it won't fire either.
Since the flash is working on test, it means the connection to the camera via the hotshoe is not working. With the flash on and ready light showing that the flash has charged, take a small thin copper wire and short between the the metal spring on the side of the hotshoe (in the slot) and the round metal contact tip of the hot shoe. This should cause the flash to fire if the internal connections to the shoe are working.
If the shoe is working then it must be the camera that is not working. Many modern digital cameras cannot fire older flashes directly, because the voltages on these older flashes are too high. This could damage the camera or if the camera has protection against the high voltage, that will make it impossible to fire the flash. In that case you need an adapter. These are available cheaply. You should try borrowing a modern flash to test that your camera is still working and has not been damaged, if it is a modern electronic camera.
Have you tried to reset the camera to its factory defaults to see if it is a setting that is causing the flash not to fire? To reset the camera go to the menu left arrow to reset - highlight yes and press ok. This will set the camera back to factory settings. See if the flash fires now. If it does then, good. If not, then it is a repair issue with the flash assembly internally in the camera.
Check if something is preventing the flash to pop up 'fully'. Check for some dust or other particles trapped between the flash and the body. Does the screen say 'Subject is too dark'? If so, the flash has not popped up fully.