Before you touch any component inside your device, ensure you are properly grounded with an anti-static band.

Gently lift the heat sink from the motherboard, making sure not to apply much tension to the connector cable.

Using your thumb and forefinger, gently unplug the connector cable from the motherboard.

Lift the heat sink from the motherboard.

If you need to replace the heat sink, check out this thermal paste guide that will walk you through the steps necessary to replace the thermal compound.