I think I just don't get it. If I turn around in the right moment I'll probably find it trying to bite me in the butt...
How do I get to an interface to actually do something with the repository I set up in the server-manager?
I think you need to read up on subversion, my contrib implements the server part, you now need a Subversion client to instruct the server to do something, have a look in the
Subversion book for more information on Subversion and
a list of clients. I use
TortoiseSVN one when working on a windows machine, it integrates perfectly with explorer.
In the server manager I set up a repository called xo_xs_bhm and enabled all 3 kinds of access. When I access my server now through a browser (firefox) like going to https://my.server.com/xo_xs_bhm it displays a page with a heading "Revision 0: /" a horizontal separator and just one more line: Powered by Subversion version 1.4.6 (r28521). And that is it. No further menus or clues.
That seems pretty fine and standard to me.
Where do I go to check in files?
Download a client of your liking (or use the default command line svn client) and check in your source, if you have done that successfully you should see the head revision of your source when visiting the address of your repository in a browser