thE ANSWER IS THAT : the person who has sent the request of becoming your friend can go to your farm whether you agree or not, check your message box, the exact person must send a system message to you but you do not read it.
By the way, I do suggest that you can ask the question or raise the problem in simple Chinese or traditional Chinese if you can find some Chinese input software for you can solve your problem and puzzle much sooner.
Have fun!