How do i set the memory key in my 1999 Ford Taurus?

My dad owns a taurus, and well since he doesn’t read manuals, and even email technology scares the hell out of him, he never set the memory key for the seats and stuff for his 1999 Ford Taurus. The funny part is he bought it new like 9 years ago, and i thought i should take it upon myself to do it for him. Thanks friends!