The Finalsite text editor includes tools that allow you to change the "style" of your text (when web designers talk about "style," they mean the characteristics of a thing - so a text "style" covers many attributes such as the font choice, the size, the color, boldface or italics, and so on.)
The text editor has two ways to edit styles. The first, and most direct, is by using the formatting tools included in the editor toolbar:
The other way to control fonts is to use Styles Manager to establish one or more consistent text styles, and then apply those styles to a block of text. For example, you could create a style with multiple attributes denoting red, bolded, large text in the Arial font family. You could then select that style from the "Styles" dropdown menu (indicated with a paintbrush icon) and apply it to any text that you've entered in to the text editor:
Notice that in the "Styes" dropdown menu, the menu items themselves reflect the attributes of the text style. This way, you can give your text styles a helpful name that corresponds to where they should be used (such as the "Enotify_sectionX" styles) while still allowing you to preview what that text will look like on the page.
If you don't see all of the text editing controls, go to Site Manager > People > Admin Users, and make sure that all of the checkboxes are selected in the "Editor Rights" section at the lower-left.