How to Enable Google SearchWiki
You'll need to be signed into your Google account. If you don't have a Google account, you can sign up for one here.
Do I have to be signed in to Google to enable Google SearchWiki?
Yes. The feature will not work if you are not signed in. Once you are signed in, you will see two buttons next to your search results: an up arrow, and a down arrow. There will also be a little conversation cloud underneath the result.