Because I won't to help the wiki (/teenagemutantninjaturtles2012nickelodeon)
You have to ask a bureaucrat on the wiki. If he/she says no, then try, try again! If no bureaucrats or admins are present, feel free to adopt the wiki here.
Also, remember that you don't need to be an admin in order to help out.
Looks like the only bureaucrat there hasn't edited since January 2012, so I would try to adopt it.
What do you think?