Can you clarify what you mean? Do you mean you want the unlock slider to be on the lockscreen? Or do you mean you want a shortcut on the homescreen that takes you to the lockscreen?
If you want your lockscreen to be the unlock slider, go to Settings/Security/Screen lock, and select Slide.
If you want a shortcut on the homescreen that takes you to the lockscreen, try an app like Power Toggles.