Before you can edit text, you need to select the text to which you'd like to apply your changes.

Your text is ready for editing! Just type to enter new text or click the buttons on your editing toolbar to modify the current text. Click the Delete button on your keyboard to delete the text.
Hint: To select one word, click on it twice quickly with your mouse. To select all of the text in a content area, press Ctrl and A on your keyboard (Command+A on a Mac).