Safari Users
  1. Select General from the Preferences menu, which is now overlaying your browser window. Once General is selected, you will notice a section labeled Home Page in the main window of the Preferences dialog.
  2. Directly to the right of the "Home Page" label is an edit field containing your current home page URL. In the example below, Safari's current home page is http://www.apple.com. To modify this address, simply erase the contents of the edit field and replace it with the web address below. http://www.commercialvehiclerentals.co.uk

See image below: