How do you sign up for look alike?

How do you sign up for look alike?
Simply by typing in. Up at the top of your computer in Live search .
Typing in "Look alikes". Also do this, by looking up some of your interest. Examples:
Look up Johnny Depp Look alikes, Selena Gomez look alikes, Celebrites Look alikes. So you do have some options.
Also try going to Ask.com. Ask them for How do you sign up for look alikes.
They will give you answers too.