Do you need to add lines or arrows to different objects in the Workspace?
First, Select the Arrow/Line Tool icon.
Four pop-ups will appear of different ways to edit your Arrow/Line. Change the Line end points, thickness, style, and color from these choices.
Once you've customized the arrow or line, Click and Drag in an empty space of your Workspace to form an arrow/line.
You'll notice that when the arrow/line is highlighted in yellow, an edit bar will appear, allowing you to redesign. When its highlighted, you will also be able to adjust the location of the arrow/line by clicking and dragging it elsewhere.
Additionally, if you want to adjust the length or angle of the arrow/line, select the arrow/line and click and drag the red circle indicators at each end as needed.