On the right side of the motherboard there is a coin shaped capacitor. In picture two you can see a detailed view of the capacitor (5.5V 0.22F).

Note which polarity of the capacitor is facing which side on a piece of paper.

Remove the capacitor.

Looking at you piece of paper, solder the new capacitor in THE RIGHT DIRECTION (POLARITY) to the remaining wires from the removed capacitor.