How do I force a paragraph to not indent?

You may wish to set your overall paragraph setting to "Indented paragraphs," but keep some paragraphs non-indented. You can do this in a couple of ways:

1. Using the TEXT Editor, make sure all the paragraphs you don't want indented have the following tag:

2. Using the Visual Editor:

i. Highlight and select the paragraphs you want to display without indentation

ii. From the Visual Editor toolbar, select Formats > No indent 

And you are done! See the screengrab below: