Use the styles in the formatting section please.
You will not be able to see exactly what the styles look like as you apply them! But you can always update the section and view the styles on the public site. If you don’t like them then you can change them!
If you want the text to be formatted in a similar fashion to the rest of the site use the styles in the format drop down menu. Why would you do this? To keep the site looking professional and consistent, use additional styles sparingly. To do this highlight the text you want to change and then choose the appropriate style from the drop drown.