The mod works simply by adding the armor of your choice into the custom named level list with the intended value from the list shown below:

aaBrandedIronArmor
aaDaedricArmor
aaDaedricBoots
aaDaedricGauntlets
aaDaedricHelmet
aaDragonplateArmor
aaDragonplateBoots
aaDragonplateGauntlets
aaDragonplateHelmet
aaDragonscaleBoots
aaDragonscaleGauntlets
aaDragonscaleHelmet
aaDwarvenArmor
aaDwarvenBoots
aaDwarvenGauntlets
aaDwarvenHelmet
aaEbonyArmor
aaEbonyBoots
aaEbonyGauntlets
aaEbonyHelmet
aaElvenArmor
aaElvenBoots
aaElvenGauntlets
aaElvenGildedArmor
aaElvenHelmet
aaGlassArmor
aaGlassBoots
aaGlassGauntlets
aaGlassHelmet
aaHideArmor
aaHideBoots
aaHideGauntlets
aaHideHelmet
aaIronArmor
aaIronBoots
aaIronGauntlets
aaIronHelmet
aaLeatherArmor
aaLeatherBoots
aaLeatherGauntlets
aaLeatherHelmet
aaOrcishArmor
aaOrcishBoots
aaOrcishGauntlets
aaOrcishHelmet
aaScaledArmor
aaScaledBoots
aaScaledGauntlets
aaScaledHelmet
aaSteelArmor
aaSteelBoots
aaSteelGauntlets
aaSteelHelmet
aaSteelPlateArmor
aaSteelPlateBoots
aaSteelPlateGauntlets
aaSteelPlateHelmet
aaStuddedArmor

This armor will then show up in the appropriate level lists in the Skyrim game. For example, if I intended to put a custom made leather cuirass into the Skyrim level lists then I would place the custom made leather cuirass into the sub-level list entitled aaLeatherArmor. 

In order to make this mod function correctly, you need to transform your mod into an .esm file. You can accomplish this through using Wrye Bash which can be found at the following link: http://skyrim.nexusmods.com/mods/1840

After making your mod of choice into an .esm file then load your mod with the Creation Kit as the Master for this mod (Effortless Level List Creation). 

Make the changes as intended, save the Effortless Level List Creation mod, rename the Effortless Level List Creation mod if desired, and then run the game.