Welcome to the forum!!
I am not sure I understand what your saying, you may need to be more clear and divide up your sentence structure better. This will help people answer your question rather then spending the time trying to understand what you asked.
So you have a 2012 Focus. Your saying some one pulled the valve cover off and adjusted your timing? and you want to put the timing back to stock?
I am not familiar with the 2012's and their function but unless a lot changed you cant manually adjust the timing. a Chilton or Haynes manual will be of a good asset and will give you torque ratings and the order to tighten it down.
2001 ZX3 2.0L Zetec-
Hatch Nation #42
Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)