After you install the extension, new icon will appear on the toolbar. Simply click this icon when you are on any Google page and have fun rearranging the links! If the Google page was open before you have installed the extension, you should reload it.
Make sure you allow interaction with secure pages in extension's privacy settings! Otherwise the extension may not work.
Use the options page to hide the extension icon from the toolbar.
Please report any issues or feature requests on extension user-group (http://groups.google.com/group/cgm-users/). Source code and additional README file are available at https://github.com/fralik/CGM/