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.
Step 1: System Preferences
Open System Preferences by:
a) going to the Apple Menu (on the upper left hand corner of the screen) and selecting System Preferences; or
b) clicking on the System Preferences icon on the Dock.