how do i set mark on 01 dodge neon if the belt is sliping around crankshaft grar on 2001 Dodge Neon

01 dodge neon was broutght to me not running was told that it need timing belt but when i tore it down ithe belt was so slack it would not turn crankshaft gear how do i set timing mark

Asked by for the 2001 Dodge Neon
Get a new belt and a haynes manual (or factory would be better).