The convention used in this question involves expressing the direction of the vector as an angle of rotation from one of the nearby axes. This vector lies between North and West. You might describe it as being rotated westward from North. Or you could decribe it as being rotated northward from West. Either way, you will need to measure the angle the vector makes with North or West. Then describe the direction you have measured from. If you measured the angle the vector makes with North, then you have measured the angle West of North. On the other hand, if you measured the angle the vector makes with West, then you have measured the North of West.
The protractor can be dragged on top of the vector so that the origin of the protractor lies at the tail of the vector; that's the dot ... not the arrowhead. Bold markings are shown every 15°. This allows you to measure the angle of rotation. Complete this task and then enter the angle into the answer field. Finally, tap (or click) on the box with the "--" symbol to identify the angle as being measured either North of West or West of North.