I have DotNetNuke set up in a subdomain and want to create a new parent portal on a different domain.  How do i do this on a shared server?

I have an account w/ a hosting company (Arvixe.com).  I created my first DNN portal in a subdomain (like dnn.OneDomain.com).  That works fine.  I put dnn.OneDomain.com or www.dnn.OneDomain.com in my browser & it goes to my DNN portal.  Arvixe's file manager indicates that those files are in my account's /home/dnn.OneDomain.com/wwwroot/Portals/0.

I'd like to create a second parent portal (AnotherDomain.com), but cannot figure out how.  I registered the second domain name & had it point to Arvixe's name server.  I created a website for the second domain using Arvixe's system, so it created a file directory for me with some very basic files.  I put AnotherDomain.com in my browser & I see something like "We're working on setting up a site here".  Those files are in /home/AnotherDomain.com/wwwroot.

Next, I logged onto DNN in dnn.OneDomain.com and told it to create a parent portal at AnotherDomain.com.  I took the default for the Home Directory, so it created files in /home/dnn.OneDomain.com/wwwroot/Portals/1.  (I tried to change it to ../../logosgal.com/[PortalID], but got a message saying that's invalid).

Now, when I put AnotherDomain.com in my browser, I still see the "We're working on setting up a site here" message, not my DNN portal.

So, how do I get AnotherDomain.com to go to my second DNN portal?  I don't see any options in either DNN or Arvixe's system that looks like it will let me do this.  Do I need to ask Arvixe's tech support to do something (they've been very helpful)?Do I need to install DNN in AnotherDomain.com?

Any help with this would be much appreciated!

Erik, Thanks for your reply! Unfortunately, I have not been able to figure out how to create an alias domain. Is that something I do in DNN? Through my domain name registrar? Through my hosting company (in the control panel? ask tech support?)? Alternatively, might I be able get my registrar or hosting company's tech support people to do some or all of the steps you listed in the first part of your answer? Which company would need to do which part(s)? Also, I'm not sure what you're saying about email. Would we be able to have addresses@dnn.OneDomain.com & addresses@AnotherDomain.com. Only one or the other? Neither? I'm sorry to be asking such ignorant questions. I'm a C programmer trying to learn .NET, web development, DNN, etc., etc., not a web server expert.