I believe on that board you want one stick in the 1st slot and another one in the 3rd slot.
But don't worry you can't screw this up. Just try 1st and 3rd and boot up the computer. Then download CPU-Z:
Then open up CPU-Z and under the "Memory" tab you will see a spot that says "Channels #"
If it says "Single" in the box, then shut down your computer and change the stick from slot 3 to slot 2. If it says "Dual" then the RAM is in the correct slots and you are running in dual channel mode.
As far as setting your multipliers goes, I would just leave them at default for now until you want to start overclocking. For the LDT multiplier you will want 5X. For the HTT/CPU multiplier you will want 9X ( I think).