All versions of our Google Apps Login plugin will add a new ‘Login with Google’ button to the login page of your WordPress site. However, you might also want to add a ‘Login with Google’ button to other pages of your site – for example in a sidebar widget to appear on every page.
The easiest way to add a Login with Google button anywhere on the site is to create a link to /wp-login.php?gaautologin=true
<a href="/wp-login.php?gaautologin=true">Login with Google!</a>
You should be able to add this to your sidebar using the standard Text/HTML Widget in WordPress, and of course you should also be able to style the link into a button via your Theme’s styles.
Please contact us if you have any questions about how to implement this!