Contact support to delete the log directory (or any other file or directory owned by 'root' or 'dhapache')
The subdomains may become available again over time; but support might be able to clear them sooner.
Huh? There is no proper order. Perhaps you are confused by the fact that you have to have a hostname associated with the database; and that hostname will be a subdomain too.
Say your domain is example.com and you want people to browse to http://familytree.example.com/
First setup the fully-hosted subdomain familytree.example.com in Manage Domains.
Once you get the empty directory page in your browser, go back and go to the web panel.
From here you have a choice. You can setup the database first if you want; that way you can use PHPMyAdmin to make sure the database is setup before you do the install. Otherwise the one-click install will let you setup a new database at the same time it does the install.
Keep in mind though that database may take some time to be setup - thus if you create the database at install time, make sure to use PHPMyAdmin to check that the database is available before proceeding to the part of the install where you setup and configure the software.
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