Broiler Chickens are made to only live for about 45 days as they are meat birds, often they grow quickly and become too heavy to hold themselves up. I say this because this may be the reason Muffin fell off the perch.
As with a broken leg, you would have to immobilize the wing entire wing tip with a popsicle stick or tongue depressor cut to the wing tip size and you could use strips of clean cloth to wrap the wing with the stick to hold the tip from moving and just let it heal. I am going to see if we can get someone more experienced than me. So we know we are doing the right thing.
@Overo Mare can you take a look at this person's problem and please give some advice.
I don't know when she gets up, but I am sure she will help.