1. Firstly go to www.facebook.com and you will have to go to login box but you don’t have to login, just click on forgot password .
2. Enter your email id to reset password .
3. Then just go to your email and change your password.
4. After that login to your Facebook account with the new password.
5. Now you can easily send a friend request to any person, your friend request is unblocked .
Enjoy the trick.