How to add paragraph symbol
You can enable "Show Invisibles" from View &gt; Show Invisibles or ⌘ Command+⇧ Shift+I to see these "invisible" characters in Pages. These are invisibles that appear when the selection highlight goes over their area, and disappear when unhighlighted. For identification purposes they're usually colored blue.

To add a non-invisible paragraph symbol (or any other delimiter of your choice), ⌃ Control+⌘ Command+Space should bring up a "Characters" window, from which you can double-click on any character to add it to the current text field.

The characters under this window follow their Unicode specification, so some names might seem a little weird (e.g. "Place of Interest Sign" for "⌘").  The name for the Paragraph symbol is "Pilcrow".