CAn anyone pls tell me how to use a d.a well??
And how to use it for pvp and pk spree

I think u mean DA(Dark Avenger)
DA is good at pvp 1 vs 1 but not so usefull in mass pvp.First of all use ur panther...he has twice P.Attk as the char has.Some useful skills are Shackle,Shield stun,Shield slam,UD,Vengeance.U should use Shield stun all the time and if u play against an archer/mage use shackle in order to stop him running.Also Shield Slam if it works silences the enemy or disarms his weapon.When u are ready to fall and u are not fighting a mage/archer use UD/Veangence that will give u High p.def.. but u will not be able to walk till it ends.Also Touch of Death is gr8...when u have low HP use it to cancel the enemy.
Thats the bar i use.