WordPress MU

Help!
Problem: Only initial Blog appears. Unable to create New Blogs. To test the system I created an account with these results: User receives Activation email ok, but Link resolves to "Under Construction" page. Therefore no subsequent email with PW is sent. So no Blog is Created.
Here is my Profile.
Version:Latest Mu.5a
Hosting: Shared/NetworkSolutions Server
New Blog Path: //name.domain.com/directory/
NetworkSolutions says "name" needs to be a "subdomain" or already in a folder.
Has anyone else had this problem? Is ther a solution a newbee to PHP can put in place?
Many thanks in advance for your help.

You can start by reading the readme.txt file, included with the download.

If it isn't resolving, then you missed a few steps or your DNS wildcard is taking a while to propagate.