Take the Matzot in the order that they are lying on the tray - the broken piece between the two whole Matzot; hold them in your hand and recite the following blessing:
Blessed are You, L-rd, our G-d, King of the universe, who brings forth bread from the earth.
Do not break anything off the Matzot. First put down the third Matza (the bottom one), and recite the following blessing over the broken Matza and the top one.
When reciting the following blessing, have in mind that it refers also to the eating of the "Sandwich" of Korech - which will be made with the third Matza - and also the eating of the Afikoman.
Blessed are You, L-rd, our G-d, King of the universe, who has sanctified us with His commandments and commanded us concerning the eating of Matzah.
Now break off a kezayit (the volume of one olive) of the two Matzot held, and eat the 2 pieces together in reclining position.