If you want to add Membership Provider features to your WebHost4Life application, I've found that you can't use the aspnet_regsql wizard UI. Instead, use the following code at the command prompt:

aspnet_regsql -C "Data Source=sqlNNN.mysite4now.com;Initial Catalog=yourdb;User Id=yourUserName;Password=yourPwd" -A mr

Replace NNN with your assigned address, and obviously replace the other elements of the above connection string, too.