Changing admin password?

Please could someone tell me the proper way to change the administrator's password in Pier? Last week, I could do it by using the Pier Browser, exploring the root, and sending a password: message to the adminUser instance. I've now created a new image, with the latest Pier packages from Squeak Map. Even though the password appears to change in the instance, the old passwords (user=admin, password=pier) remain in use. I realise I'm probably doing something stupid :-) Thanks for any help, Duncan. P.S. With the latest Squeak Map Pier package the Pier Browser doesn't appear to be added to the Tools flap like last time.