Brian, you want to make these edits under Pages>Theme>theme.scss. You would then look through your stylesheet and make the changes. For example, your current theme has the following body text style:

#body {
text-align: left;
font-size: 14px;
font-family: $fonts;
line-height: 22px;
p { margin: 1.12em 0; }
strong { font-weight: bold; }
em { font-style: italic; }

You would take this, make your edits, and place the updated code at the bottom of your theme.scss file.

If you need more guidance, please send us an email to [email protected] with more details.