There are 2 types of Golpes, one done below the sound hole next to the bridge, the other done directly above the sound hole. I'll start with the one done below, since it's more common and easier.

To produce this golpe strum the chord with your thumb and at the same time bring the 3rd finger (A) down to strike the guitar.

The one done above is with a flicking motion. Put the thumb and 2nd finger together, flick the 2nd finger across the strings and bring the thumb done to strike the guitar.

*Make sure you have a tap plate on your guitar or you'll dent it up pretty fast.