Need Help adding a class Special

[Nexus_Light]

So on my limited ability to really understand what I need to do, I have come to a halt on my progress. I am trying to figure out how to make hero labs use the custom class special I have made for the everyman ninja Archetype I have made.

Essentially I am trying to figure out how to make it see the ability, show it, and do the additonal thing of tracking the bonus as you level up, I can post bwllow what the ability does.

Dispatchment (Ex)

At 4th level, whenever a ninja attacks an opponent that would be denied a Dexterity bonus to AC or when she flanks her target, she gains a +2 bonus on her attack roll. At 9th level and every 5 levels thereafter, this bonus increases by +1 (to a total maximum of +5).

[Minous]

Id just use a activation checkbox (instead of having it try to check for flanking itself) and then I think xLevel should give you your total number of levels in that class, then just use that to calculate the bonus, store it in abValue, and if enabled add abValue to the attack roll.