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Assuming you have an account already, log on to the admin panel here. Once you've logged in, click on Add under Access-Paths. You should now see a text field and a create button. Enter in the desired name of your repo followed by a colon and a slash (e.g., "my_repo:/"), then click Create. Your repo should be now created and you should be able to see it if you click on List under Access-Paths.
Now that you've created a repo, you'll want to check out a local copy. As a running example, you can run the following command in a terminal:
svn co https://svn.ics.uci.edu/svnadmin/titans/my_repo/
If you're not familiar with SVN, you can find a nice tutorial here.