I think you have to download some extra software from a third party in order to create a repository, which nobody tells you about.
I stumbled across something called Sliksvn in the internet which I downloaded and installed and got running in the command line. It was like a 5 MB download, just to run one command which created a few folders and database file. I don't think I'll need it again since NetBeans has all the necessary functionality built in.
Quite an omission, IMO, and frustrating and time-wasting. Why include 99% of the code but leave out the 1% so you have to download the whole lot from somewhere else?
Unless, of course, I'm doing it wrong, but I wouldn't know because the documentation is out-of-date and no-one here seems to know either.
Which documentation are you referring to? The Netbeans documentation states clearly that it only provides funcionality to access an existing repository (http://netbeans.org/kb/docs/ide/subversion.html#ensuring) and names also the reasons for that.
I guess a lot of people know that here. But I guess those were not reading your post within this 7 hours you found it out yourself.
Due to the fact that subversion is MORE than just checking in and out, I recommend to read the official documentation: http://svnbook.red-bean.com/en/1.5/index.html
I read the guide that you quote, and went to the command line and tried to use svnadmin, but just got the message saying it wasn't recognized as a command. There are no clues as to where you need to get it from. Also the Help files in NetBeans itself were no more helpful. I think I even came across the official svn documentation that you quote as well, but that doesn't tell you how to get it or provide any links either!
A case of easy when you know how I guess, but not to someone who hasn't used it before.