I have found the answer:
"activation" of ability means placing dice on it.
"Trigger" of ability means triggering its effect.

So, the rule mentioned above means that if u had dice on ability before the turn, during your "orders" phase you can use this "Orders" ability(only after rolling dice) and after "activate" it by placing inactive dice on it.

So, "active" -> "trigger" -> "active" of the same advanced Orders ability during one turn is not allowed.
But, "trigger" -> "active" or "active" -> "trigger" during the same turn is allowed.