Tutorial 3: Line labels
To clarify the relationships we have so far, let's use the Text tool to add labels to the connection lines. Get out of the outline view by clicking some empty space on the canvas.
Click the Text tool; it's the one with a letter 'A' on it. Then click it again so that it'll stay active instead of reverting back to the selection tool after you use it.
Put the mouse pointer over the line between Don Pedro and Claudio so that the line glows, then click it. Type "boss" into the label's text to show that Claudio works for Don Pedro. 
Add labels to the three remaining lines in the same way, indicating that Don Pedro is also Benedick's "boss", and that Leonato is Hero's "father" and Beatrice's "uncle". 