How to navigate with GNS-530 WAAS

[Paul12 2]

What is the correct procedure to get dead on over a certain waypoint or airport ?
 See attached screen shot.

 1) To follow the magenta line ?
 2) To bring the green vertical bar into the center of the green triangle ?
    When bar is to the left make a left turn,when bar is to the right,make a right turn.
 3) To adjust TRK to DTK ? 
 4) Other methods ?

I appreciate your help since I never achieved the specified goal.http://tinypic.com/r/110iyhu/9

[RXP 2,338]

Hi,

The autopilot is following the heading bug (HDG mode). Make sure to enable NAV mode instead.