Two methods one tool
The first with the filter facing down allowing the coffee to percolate. The second, called inverted, requires to be infused by turning the instrument with the filter upwards.
The Aeropress consists of a brew chamber with two filters - a plastic one and one made of disposable paper - and a second part with a rubber seal (like a syringe) which is used to create pressure.
Wet the coffee filter with hot water to get rid of paper taste and to make the filter attach to its holder.