You can't really say HOW to flair, because all planes will respond differently when you do it, but the gist of it is: You're flying straight toward the runway at a slightly nose-down attitude and just above stall speed. If you maintain this attitude you will plant your nosewheel into the gound - you will land, but it won't be pretty.

So just before touching down, you "Flair" the plane by adding a tad of up elevator to level out the angle of attack. In an ideal situation, you are going slow enough that you can even lower the tail a bit without gaining altitude. As the plane aproaches its stall speed, it will start to desend before it completely stalls, but since you are only inches from the ground, it lands before a complete stall occurs.