We need to "Install New Software" option available in the Eclipse

Steps for installation:
1. Click Help –> Install New Software



2. Click [Add…] button

3. In put [TestNG] into Name field and input [http://beust.com/eclipse] after click button [Archive…]




4. Click [Next] button

5. Click [Finish] button

This will install the TestNG plug-in for Eclipse
After the installation, it will ask for restart of Eclipse.  Then restart the Eclipse.
Once the Eclipse is restarted, we can see the TestNG icons & menu items as in the below figures.



This is some screenshots help you setup TestNG in Eclipse.
I hope this acticles help people who like to use combine Selenium and TestNG .