If you've already typed in some text and wish to style some of it:

1. Highlight the text you wish to style by selecting it with the mouse.
2. Click the buttons for the style you wish to add. For example, for bold text, for italic text, or for underlined text.

Styles can be combined. For example, you can create bold and underlined text by clicking both the and buttons after selecting text.

If you know you want styled text before you type, click the button first then type. The button will appear pressed for the duration of the style, then you can click it again to stop using that style.