Plot Annotation Toolbar

Use the buttons and tools provided on the Annotation toolbar to add Text and Text Callout labels and arrows to the plot.

Click the Edit labels button to put the plot into Edit Labels mode and enable the tools on the Annotation toolbar.
To set Labelling options, click the Edit Annotation Sets button.
  The Active Options combo box on the Annotation toolbar indicates the current working set. Selecting [Defaults] will reset everything to reasonable system defaults.
 
Use the Format Picker tool to pick up (arrowhead, colour, line width, angle units etc.) format settings from an existing annotation object.
Use the Format Painter tool to apply the current format settings to selected annotation objects.
Click the Arrow tool to add an Arrow line to the plot.
Click the Text tool to add a Text label to the plot.
Click the Text Callout tool to add a Text Callout label to the plot.
Click the Edit Text button to edit the selected Text or Callout Text label.

Annotation Frame

Plot Labels

Plot Editor Toolbar