How to extend the power cord of MacBook?

Hi!
I know its a very silly question...!
but i don't know where to connect the the power cord extension on the power adapter...

Welcome to the Apple discussions.
Disconnect the adaptor from the wall and the MacBook. Hold the adaptor in your left hand so that the cord going to the MacBook is on the left, and the power prongs are on the TOP right. Grasp the white plastic holding the prongs with the thumb and fingers of the right hand. Hold the whole adaptor flat and horizontal. Using the right hand, slide the prongs section horizontally AWAY from you. The prong section should just slide off. The power cord can then be fitted to replace the prongs by reversing the process.
Hope this helps
Bob

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