You have now linked the Force.com IDE environment to Subclipse in a general way. Your next step is to connect your repository to the environment.
Open the SVN Repository Exploring perspective in the IDE, which will open the SVN Repositories view.
Use the Add SVN Repository icon on the far right to configure Subclipse to access the local repository. The URL to access your repository locally is file:///svn_repos. You should see the repository listed in the view, though it will be pretty dull as the repository is currently empty.