I am using the website wizard to edit site. http://www.phinixinstitute.bravehost.com/ The site will come up using the long version, but until today you could just type phinixinstitute.com and it would bring the site up too.
You need to set up your domain re-direct by clicking on the domain tab. Then click 'Setup domain redirection' and then 'Redirect a domain.' From there select your domain and enter your sub-domain and then click create re-direct.