Hello everybody, i would like to know if you know some code to get my hunt in range against mob if they go to melee so that i can use my ranged weapon again ?

I can't tell exactly what you're asking for, but assuming the range that you have to start meleeing at is 5, the below should work.

using wManager.Wow.ObjectManager;

if (ObjectManager.Target.GetDistance <= 5){
 // do melee stuff
}
else {
 // do ranged stuff
}

Well for example, i get the aggro or the mob get too close, i want the bot to backup a bit so that i can use my ranged weapon again