Hi XXXXXXX.
Thank you for asking your question on JustAnswer.
All you need to do is take a wrench and rotate the crankshaft back to where is was set for top dead center. If the belt was already on then your going to have to remove the belt and align the cams and the crank again before installing the belt again.
ASE Certified Technician
23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs