won't shift into any gear but 1st

What is your question?

Trying to find some answers for my friend on his car. Its a grand am. It'll only go into 1st gear it won't shift into any other gear.It was working fine, then he tried to reverse to back out the drive way and it wouldn't go into reverse so he just pulled forward and the figured out it wouldn't go into second so he just parked it.He just replaced the transmission in it. What could be the problem?