How to Unblock Sites Using the Terminal Mac OS X Application for MacBook

Click the 'Finder' icon on the dock at the bottom of the screen.
Click 'Applications' at the left side of the Finder window, double-click the 'Utilities' folder and double-click 'Terminal.'
Type 'sudo nano /private/etc/hosts' into the terminal window and press 'Enter' to open the hosts file in a terminal text editor.
Use the arrow keys to locate the line referring to the blocked website in the text editor.
Position the text cursor at the beginning of the line.
Type a '#' character to comment out the line. The system ignores any lines in configuration files that begin with the '#' character.
Press 'Ctrl+O' and then press 'Enter' to save the file.
Press 'Ctrl+X' to close Nano, then close the terminal window.
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