I'm trying to use a reverse lens adapter for macro pics, but the shutter does not work. I understand the pins are not in contact. I have heard there is an option in the menu to release the shutter without a lens being properly mounted. Can you help me?
You should be able to do it. Open the menu and go to the C.Fn tab. Look for "Release shutter w/o lens" and set it to "Enable". Detailed in the manual on page 186.