How to setup hostname for wordpress oneclick

I get this error from Dreamhost when I try to set up Wordpress oneclick install.

I’m just trying to set this up so our web guru can setup a webpage for us, I had given her FTP access but she wants the main login and password so she can do it her self. That I dont wnt to do and was trying to set up Wordpress one install. but I get this error from Dreamhost.

Thanks in advance

We were unable to set up WordPress as requested at:

The problem was Invalid DB: spectrumsaddleshop_com on has no hostnames set up!