If you want to change how a feature looks you can select it in the feature curtain, then go to Features -> Edit feature style. Then you can change the shape to an arrow.
Then, if it's facing in the wrong direction you select the feature in the features curtain, and click the box on the feature that has two arrows pointing in opposite directions.This is the "reverse feature" button so it will flip the direction of the arrow (and also changes the translation to be read in the opposite direction if the feature is translated)