Q. How do I use Subversion in Eclipse?
A. Install the subclipse plugin.
Help > Install New Software
Add location http://subclipse.tigris.org/update_1.4.x (there is a 1.6 but it didn't work for me)
Install all subpackages available from there.
Windows > Open Perspective > Other > SVN Repository Exploring
Add your location by right clicking on the left pane
Right click on your project and "Check Out" is an option in the menu.
Create as a new project in the workspace.
Make your changes in the Eclipse project.
Right click on your file and follow
Team > Commit...