Adding and editing text boxes
Adding a text box
Select the text box tool in the toolbar and click on a empty spot on the drawing area.
Editing a text box
Select the text box tool in the toolbar and click inside a text box. Selected text can be formated by right-clicking to bring up the text formating popover.
Use the "abc ↔ αβγ" button to convert text to greek symbols.
Use "cmd" + "u", "cmd + "d" or "cmd" + "0" shortcuts to format text as superscript, subscript or plain text.
Selected text can also be formatted with the usual system font panel (open Font panel).