My Post is in All Caps

You have a text-transform in your CSS for the p tag.

View post on imgur.com

Remove it in your CSS or override with

p {
  text-transform: none;
}

To add CSS: If your theme has a custom CSS option, use that to add the CSS shown above. If not, install the plugin Simple Custom CSS. Or, if you have Jetpack installed, enable its Custom CSS module.

Learn the Chrome Developer Tools to help you see and test changes to your CSS.