My phone is 'samsumg s2 plus' i wana root my phone Am using samsumg s2 plus. I wanna root my phone. Suggests me best way.

Already tryed the www.unlockroot.com website.  But I failed. 
Help me ..
Rooting the Samsung Galaxy S2 Plus

Here is a Youtube video with the steps to root the device, below are the written instructions I've modified this from the XDA post for grammar etc. 

Prerequisites:


Android 4.2.2 (If you want to flash custom rom ||| if not 4.1.2 is okay)
You can flash 4.2.2 via odin  find your firmware at Sam Mobile
USB Cable
Samsung USB Drivers
Odin 3.07 (Flashing Tool)(http://d-h.st/hSj)
CWM Recovery I9105/P(http://d-h.st/oKe) (Android 4.1.2)
CWM Recovery I9105P(http://d-h.st/II4) (Android 4.2.2)
CWM Recovery I9105(http://d-h.st/bq8) (Android 4.2.2)
Root Package(http://download.chainfire.eu/) - Locate most up to date SuperSU Zip.


Rooting the device:


Open Odin 3.07.exe
Put your phone into Download Mode
(Power button - Home button - Volume down button,at same time)
When you enter in Download Mod, you should get blue box on Odin 3.07 
Uncheck  Auto Reboot option
Go to PDA and find your recovery, then click on OK
After you checked everything click on Start
It should take around up to 30 - 40 seconds
When its finished take out battery, put it again
Go to recovery mode
(Power button - Home button - Volume up button,at the same time)
Navigate with Volume Rockers (Volume Up -  Volume Down)
Select via Power Button
Go to install zip from sdcard ( if you putted in your phone)
Go to install zip from sdcard/sdcard1 (if you putted on sdcard)
Find root package, and install it via pressing power button
Go back and reboot system now


DONE !
You have rooted your s2 plus !