How to change the local directory of SVN in PhpStorm?

I've installed the SVN Toolbar plugin in PhpStorm.

This is my project's folder structure (psudo):

    \Project Root

        \folder1

        \folder2

        \www

            \folder3

            \folder4

            \server

And at first, I use checkout to set the folder `server` as the local destination folder for SVN. It works fine.

Now I need to change local folder to another one, i.e. `www`. But I don't know how to do it.

No matter what I did, it always took `server` as the local destination folder.

And in the left side Project structure pane in PhpStorm, only folder `server` has a 'Subversion' menu item in the right click menu. How can I make folder `www` instead of folder `server` to have this 'Subversion' menu item?