Gremlin wrote: good job not answering the question dds all you did was raise more
Questions needs to be clear before they're answered.
Anyhow, if you're asking how to duel in general then there is two dueling systems: first one is Dueling Network and the second one is YGOPro - which has many varianets such as DevPro, YGOPro Salvation etc - you pick one or both.
If you're asking how we arrange duels in this academy: you ask others for a duel either in chat or in battle arena challenges forum and if someone accepted your challenge both of you proceed and have a match. After you're done you report the result in the battle arena forum so we update the ladder - can be found on the widget to your right.