Applying paste to a square cooler is a bit more challenging than a round one, because simply placing a dot and applying pressure will not result in full coverage. There are varying approaches that people claim allegiances to, so we’ll cover a few of the more popular ones:  The lines method – Place two thin lines of thermal compound on the base of the cooler. The lines should be parallel and spaced so that they are each placed a third of the width of the processor. The lines themselves should also be about a third of the processor’s width in length. The cross method – This is very similar to the previous method, but the lines are crossed in an “X” pattern instead of parallel. The length and thickness of the lines should be the same as the previous method. The spread method – This is one of the most popular and effective methods, but takes a little more effort. Place a small amount of thermal paste onto the base of the cooler. Using a plastic finger protector or a plastic bag, use your finger to spread the paste evenly across the surface. Make sure to cover the entire surface that will be in contact with the processor, and ensure that you do not apply the paste too thick. In most cases, the paste should barely hide the metal underneath. If you are using either of the line methods, apply even pressure to the heat sink as you install it to ensure that the paste covers the entire surface. If you are using the spread method, you MUST install the heat sink at a slight angle to prevent bubbles from forming. This is because the paste is usually spread too thin to compensate for bubbles after pressure is applied. The CPU fan wire should be plugged in the CPU fan socket because it mostly has the PWM function which allows the computer to adjust the fan speed automatically without changing voltage. Check that the fan is spinning. Enter the BIOS by pressing F1 or Del key during POST. Check if the temperature is normal, CPU temperature should be below 40 degree Celsius when idle, same for GPU.

TL;DR in Indonesian:
Oleskan pasta ke dasar pendingin. Tempelkan heat sink. Hubungkan kembali kipas ke papan induk. Nyalakan komputer.