Nextend Google Connect -operation issue

Hello,
I’ve install the plugin and folowed the instructions.
When i press the link :
<img src=”my image” />
Nothing happens.

I installed the Google Client ID,Google Client Secret and Google API key as it explained at the setup instructions, but still nothing happen.
I must say that i work with the facebook aplication and it function great.

Please advice.
Best Regards,
Noam

http://ww.wp.xz.cn/extend/plugins/nextend-google-connect/