Follow the instructions on this webpage to change your Google Chrome search engine settings.
1. Click the Customize and control Google Chrome icon in the Google Chrome menu and go to Settings.
2. To change your Google Chrome search engine go to the Search section and choose a search engine from the drop-down list or click the Manage search engines… button.
3. To change your default Google Chrome search settings in the Search engines section hover your mouse over the search engine you want to use and click the Make default button that appears.
To add a new Google Chrome search engine enter the search engine name, keyword, and URL (or just the URL using a % string) into the Other search engines section. For example, to use botcrawl.com you would type http://botcrawl.com/web?q=%s. Once this is complete hover your mouse over the search engine you want to use in the Other search engines section and click the Make default button that appears.