How do i come from journal square? What train from Penn station to trenton?

You can take NJ Transit north east coridor to Princeton Junction train station. Take uber from there to Temple. This route may be cheaper and faster.

You need to take Different buses and train to reach at temple from Journal Square, All you need to do is search in google map and select Bus/Train in transport mode and you will get the all information about route and bus number also.

You have to get down at Princeton Junction and take a cab. The distance is about 8 miles

Use a taxi or Lyft or Uber

You have to Uber