To get started with Site Search tracking, login as the Super User or an Admin user and go to Administration > Websites > Manage (or Administration > Measurables > Manage). From here, edit your chosen website via the pencil icon located on the rightedit_iconand you can then enable or disable Site Search tracking for your website.

Here is what the admin UI looks like for a particular website:

All Site Search reports are available under the main menu Actions > Site Search.