It's pretty much the same as the linked question. If you are using SSO, the appropriate place to make the change is in the SSO login page. If not, it's in Login.aspx. We don't document more speciically where in that page, but a little trial and error should be all that's required. Note that upgrades will overwrite your changes, so you'll want to document them internally.

@Blake Smith - we are not using an external identity provider to validate their credentials, so I think the short answer to your question is "No - not using SSO."