OK, so now I have the network showing on my dashboard, and I tried the add site for a url that I previously had working before upgrading to multi site. I got an error that said missing or invalid site address. The url is urban-hydro-gardens.com and since it worked before I don't know why it won't recognize it. In the new site address, it showed my original url followed by a slash and then the input box for the new site address. I tried urban-hydro-gardens.com and http://www.urban-hydro-gardens.com. Neither worked.
I know I have to run domain mapping, but I would think I need to have more than one active site in the network to do this, Yes? Please help?