I think action will speak more than words so i have given screen shot to understand clearly how the thing happen .enjoy hack.

Requirement:

Backtrack os (you can get it from here)
Internet conection
&
Some Patience..

Process:

insert backtrack cd and boot from it

1. Start terminal (Application/Accessories/Terminal), type xhydra and press enter.

2. xhydra GUI opens, In the target tab, select
Single Target : 192.168.1.1

3. In passwords tab, select username: admin and In the passwords, select the password list option and browse to select your passwords file. In backtrack       default passwords file is under the directory "/pentest/passwords/sshatter/" in the file name passwords. Here i have used my custom password file.

4. Leave the default values in the Tuning tab, move to specific tab and select
http/https url : http://192.168.1.1/

5. Now go to the start tab and click on start button, the password cracking begins and result is as follows.