Select the icon in the top right hand corner and click Settings
Scroll to On Startup and select Open a specific page or a set of pages. Click Set of pages and enter the URL bt.com then click OK.
Then select Show home button under the appearance menu and select Change. Enter the URL bt.com again and click OK.
Select Tools from the browser menu
Click Options.
Within the General tab's, enter bt.com into the Home Page entry box and click OK
From menu, click on "Edit"
Select Preferences
On the General tab, type bt.com in the Home Page entry box
From menu, click on "Safari"
Select Preferences
On the General tab, type bt.com in the Home Page entry box