Hi and welcome to the forum:
For something like that, if it has broken off at a hinge point, the camera will need to be opened up, for that, if you are in the US, I would call 800-OK-Canon and talk to a tech support person.
cheers, TREVOR
"The Amount of Misery expands to fill the space available"
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
