Click the "Customize and Control" button
In the top-right corner of the Chrome window you'll see the Customise menu icon - it looks like three little black dots on top of each other - click it.
This will reveal a menu with lots of options. One of them will be named "Settings".
Select the "Settings" menu item
The Settings screen will now appear.
When you click the Settings menu item, the settings screen for Chrome will load. At the very top is a search box labeled Search settings.
When you see Site settings click on it