U
Take a look at this page for rooting the device: Rooting your Android http://www.androidcentral.com/root
There are resources on that page to root certain devices.
Here you go: Rooting your Android | Android CentralI'm also looking to root my Samsugn Galaxy S4. It's from Tmobile (sgh-m919). The problem is that your link doesn't work...Do you mind providing it again???