To change a FTP password on a domain

log into WHM
in the search bar, search for Password Mod
In the appearing domain listing, click your domain
click on the password generator
click that I saved the password
click any of the checkboxs
update the info

Usually the resulting ftp info is

host	username	password
www.setyourwaypoint.com
www.setyourwaypoint.com	tdsdrive	secret...