He said he wants to donate his kidney, not sell it. It is not illegal to advertise that you want to be an organ donor. But you're right it is illegal to advertise that you're selling human organs.

Richmand
If you want to donate your kidney, then go to Hamad and tell the staff that you want to be a donor. Inform them that you don't have an ID, but I'm sure that they will still entertain you because you want to save another life and your ID will just be their secondary concern.