To change the password of a mailbox that is under your domain, first login to Lycos Domains via

Then click "My Domains" in the top left.

Click "Mail" in the left side bar:

On the Mail page, under the "Email Accounts" section, find the mailbox whose password you want to change, and click the "Change Password" button next to it:

A dialog will pop up. Enter the NEW password, followed by the NEW password again. Passwords should be at least 10 characters and contain at least one of the following: a capital letter, a lowercase letter, a number, and a symbol. Click the "Change" button: