Getting a GB pound sign on a US keyboard layout?

Getting a GB pound sign on a US keyboard layout?
How can I do this?
Can anyone explain, in the simplest way possible please, how to designate an area of the surface to type a pound sign?
Perhaps below, or instead of, the scroll lock which I never use!
Thanks
How can I do this?
Can anyone explain, in the simplest way possible please, how to designate an area of the surface to type a pound sign?
Perhaps below, or instead of, the scroll lock which I never use!
Thanks