Once you are logged in as a CM/ECF filer, click on the Utilities menu.  Under the Your Pacer Account category, click Change Your PACER Login. Enter a new PACER login and password.  You can change the default PACER login by checking the box Make this my default PACER login. Once you associate a PACER login and a filer login, there is no way to un-associate the two without making another PACER login the default.