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I activated my webspace, CGI, and SQL.
The installation instructions tell me to create a database, and I have one (cybersphere_pn), but they also say to create a database user. I don't know how to do this, or if I need to. Help!
You can't (and don't need to) create a user, PN have done that for you already - it's your normal login name.
I've copied the mediawiki install files to my webspace (in a folder "wiki" under htdocs). I have set the permissions to on the wiki/config folder to 777 as instructed.
The ccgi server does not have a htdocs directory which probably means you have copied the files onto the wrong server - i.e. the www server (your www webspace is separate from your ccgi webspace). To upload to your ccgi webspace you ftp to ccgi.username.plus.com or cshell.plus.net.
Also you must never set all or world permissions on files on the ccgi server, it does not work. You must use 770 or 750.
Finally, when you do copy your files to the correct server, do not put php files into the cgi-bin directory and run the fixphpperms.sh script from your root directory before running any php files.
Now I'm supposed to be able to go into the config folder in my browser, click index.php, and have a setup page run. This doesn't happen. I'm prompted instead to open a php editor.
You are on the wrong server - see above.