Please go to following location to modify your SVN Repository Connection.
C:\Users\<USERNAME>\AppData\Roaming\JDeveloper\system11.1.1.5.37.60.13\o.jdeveloper.subversion\repositories.xml
Please go to following location to modify your SVN Repository Connection.
C:\Users\<USERNAME>\AppData\Roaming\JDeveloper\system11.1.1.5.37.60.13\o.jdeveloper.subversion\repositories.xml