Introduction
The charger port is located on the motherboard (the blue L-shaped piece) at the bottom of the device. In order to replace the port, a soldering kit is needed. Be sure you have all the necessary tools and safety equipment on hand before starting.
A guide to soldering can be found on iFixit's website here.
Tools
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            Disconnect speaker (which is attached by black and red wires) from back piece using plastic spudger. 
 
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                            Conclusion
                          
                          To reassemble your device, snap back piece on to the front piece and screw in both 2cm screws at the bottom.