To find the quest npcs just follow this easy steps

open quest window by pressing Q

1 press Search Mission

2 type down somewhere the coordinates which r shown



3 press this button.. it will open the coordinate system thing

4 at this field enter the coordinates u just typed down



5 press this button to save the coordinates

6 give it a name

7 ur coords window should look like this now



8 u should have somewhere on ur screen now this blue (can be any other color too) arrow which shows u the way to the coordinates of the npc



9 open map by pressing M.. there is now a blue flag at the coordinates u saved

10 when u click with ur lmb on that area u can zoom in and can see it exactly



i know many know this coords thing but still hope it helps some1