A small dab, about the size of a grain of rice, in the center.
Too much of the stuff will actually create heating issues.
What Dngrsone said is true. Do as he instructed with application when you apply it to the processor. A little thermal paste goes a long way.
Both right. It's like glue; Less is more, except none is not enough
Don't spread it either, and don't touch the bottom of the cooler after you put the paste on the CPU, the natural oils from your fingers won't help cooling capacity one bit.
Also, don't lift up the cooler once it's made contact with the paste, this will create and trap air bubbles when you clamp the cooler down. Air insulates heat, so it will decrease cooling performance.
exactly i made the mistake of putting too much and now they are completely glued together. i cannot remove it at all.