Applying CSS Classes to Text Blocks

To apply a CSS to a block of text, do the following:

In the Editor view, select the desired block of text. From the ribbon bar, open the drop-down menu which controls text tags. It's caption depends on what tags are applied to the text you've highlited and may start with one of the following: DIV Heading 1 Heading 2 Heading 3 Paragraph Plain Text
From the menu, select the classes you want to apply to the text. As you check or uncheck them, the view updates, reflecting the changes.