Now you need to go to your phone settings make sure usb debugging is checked. To do that go to Settings > Applications > Development > USB Debugging.Do not mount your sd card.
How to root your android phone with superoneclick?
You will see the screen on top first tab have root. Just click one it. You will be rooted within a few minutes. After successfully rooted a confirmation dialogue box will show that your devise is rooted now. If it so then you will see superuser icon has appear on your phone.
That's all. For more clear checked this video below: