Use the htpasswd command to manage a repository password file.
The following command adds a user to a file, or updates an exisiting user's password, where passwdfile specifies the path to the password file and username specifies the username to add or update:
htpasswd -m passwdfile username
And the following command deletes a user:
htpasswd -D passwdfile username
The path of the password file for a subverision repository will be provided to you by CIMS support.