This plugin allows you to quickly and easily add the new Google Plus badge widget to your blog running WordPress.
In the widgets window, locate the Google Plus Badge Box you have added to your sidebar, and update the Google+ Page URL.
Have you added the widget to the sidebar and saved? Have you selected the proper page type for your badge widget, and have you added your Google+ Page URL?
Yes, there are two built-in color schemes.
This is not currently supported as the settings must be configured in the widgets menu in order to ensure proper functionality. However, with some PHP trickery, it should be technically possible.