ENSURE that you have rooted your phone. Almost on every device you can do it by checking if you have the Superuser app. (However , in some procedures you might have rooted your phone without having that app)
We want the busybox libraries which can help us interact with the android system. You can download busybox installer from Play Store (or Android Market) by going here
and downloading that. Navigate to the Install Busybox tab and press the "Install" button.
Once it is installed we are ready to continue to the next step , installing the terminal.