How to Summon a
Synchro Monster1. During your Main Phase 1 or 2, when the total Level of a
Tuner Monster and 1 or more Non-
Tuner Monster(s) you control is equal to the Level of a
Synchro Monster you want to summon, you can declare that you are performing a
Synchro Summon. These
Tuner Monster and the non-
Tuner Monster(s) are called the
Synchro Material Monsters.
2. In order to
Synchro Summon a
Synchro Monster from your Extra Deck, you add the level of a
Tuner Monster on your
field to the level of another face-up
monster(s) you control. That value must be equal to the level of the
Synchro Monster you wish to summon.
3. After sending the
monsters from your side of the
field to the Graveyard, you then place the
Synchro Monster from your Extra Deck in face-up Attack Position or Defense Position on your side of the
field.
<--copyed from Yu-Gi-Oh! Wikia. The page is:
http://yugioh.wikia.com/wiki/Synchro_Summon
Hope that helps
Trust, Loyaly and Respect!