For now, whitelisting sites in Opera is done directly in Opera, outside of Ghostery's control. To whitelist a site, just follow the directions you highlighted in your screenshot.
Hi Alexei,
Thank for you reply.
I did what explained in the screenshot, but some sites still not working. I have to disable Ghostery's to have acces to the video document of the website for example.(http://www.itele.fr/direct).