Instructables
Picture of How To Manually Configure IP Address on Mac
An IP(Internet Protocol) address serves as your computer's identification. It may sometimes be necessary to know what your IP address is and how to change it for reasons such as troubleshooting, networking and file-sharing.
 
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Step 3: Active Network Connection

On the left hand side of the window is a list of connections. Select the active connection (i.e. the one with a green dot). If your security settings are set to require password to unlock each system preferences pane, click on the padlock icon on the lower left hand side of the window. This will prompt you to enter your password.

If you have successfully entered your password, the padlock icon will unlock.

NOTE : You do not have to "unlock" if you are only to view your IP address and not edit it.