Pathfinder Sheet adding armor, etc

I'm having some trouble figuring out how to use this section. I have: Armored Kilt (+1 ac) Mage Armor (+4 ac) Cloak of Resistance (+1 saves) Ring of Protection (+1 deflection) I'm trying to figure out the best way to "equip these" and make sure mage armor doesn't stack with armored kilt. (i could make mage armor a +3 buff but i feel like i want it in the armor section). When do i click the "add armor" or "add sheild" buttons on the item tab? apparently i can only have one of each?  thanks in advance

Add your items to equipment.  Set the rings to the slotted ring1 and ring2 and kilt locations. Only the armored kilt should be "Set as armor".  Ignore shield.  Create buffs for the others and toggle as needed.  Mage Armor be be created from the common buffs selector, and just add another buff  for the "Ring of Protection" to AC type:deflection.  Add a 3rd buff for your Ring of Resistance for saves. 

ok, will the system automatically know not to stack my mage armor with my kilt? or do i have to put in mage armor at a +3 instead of a +4?

As long as you are using the newer Buffs. Settings|Sheet Configuration|Use buff bonus types and stacking Kilt is a +1 armor bonus and mage armor is a +4 armor bonus, stacking rules will only apply +3. 

thank you