I am confused on a trigger for a new map.

I am making a map called Possesed. Basicly like those whos the murderer maps. Every one is a tribesman and 1 tribesman has Transform:Demon ability. I am confused on how to make a trigger that does that randomly, also people can change their class, I want it so if people change from lets say, Tribesman to shaman if that player is the demon his shaman has the transform ability. The trigger for changing classes is:
Event-Unit Aquires item
Condition-None
Action- if aquired item=to become a shaman, replace manipulating unit with a shaman.

How do I change that trigger so if the player trying to become shaman is the demon the shaman gets the ability Transform:Demon

You could.. hmm...

Anyway, store the unit with that ability in a variable. Then if the unit that transforms into a shaman is equal to that demon unit, add the ability.

For your first question, pick a random player from players that are playing (or player group matching: player slot status = is playing), and if you don't have the units set to variables, pick a random unit from (units of type X owned by that player) and give that unit the ability.

Unit - Add Mana Burn to (Random unit from (Units owned by (Random player from (All players matching (((Matching player) slot status) Equal to Is playing))) of type Warden))

^ ^

you could use the mechanical form thingo the goblin tinker has?

that should be able to use items, change your dude from one form back to the other and i think it adds items

I was not asking how to transform, I got that all down. Thanks for the help I know what to do now.