American Girl modified both their face mold and their hearing aid to enhance the Joss doll. So the question is: how do you put it on? Since the instructions can be easily lost, I decided to post a how-to on putting the hearing aid on.
These are the instructions that came with the doll.
The Joss doll came with a case for her hearing aids as well.
When you open up the case, it reveals two hearing aids (in case one gets lost) and a brush for them.
The Joss mold features has a little hole in the doll's right ear. To put the hearing aid in, you just put the clear circle part of it in the hole and adjust the rest of the hearing aid to make sure it's behind her ear.
See? It's in!