Shiny, I think you can change your password if you go to your "Edit Profile" page. At the bottom there is a box to change your password. I just decided to keep mine since I have it memorized now.
I like the changes on Rosie and Jasmine too. Let's see, is Jasmine the one with the lighter grey fur? Does that mean she has the red collar on? If we go by their fashion personas, then she is more punk and edgy and Rosie is more girly?