This add-on can only be installed by our internal team at this time, if you wish to add it please submit a ticket to our support here. If this has been successfully installed on your website, it should appear when you do a member search with no results, here's an example:

Once installed, if you need to disable this addon, you can go to Settings >> Design Settings >> Search Results Design > Find Google Search Assist.

Select on EnableĀ or DisableĀ and click on Save Changes.