Once you log into Sedo, there should be some options on the left side of the screen. You should see a link for "Statistics". Click this. If you don't see it, you can also get there by clicking the "Domain Parking" link.
Scroll to the bottom of the page, if the domain in question isn't already showing there among the others, you can scroll back up and Select your domain, date range etc.
Right beside the actual domain name on the left, there will be an icon with what looks like a small letter " i ". Click it.
This should bring up a page with visitor origin, keyword details, etc.
Hope this helps