[scribus] Colors for text (rush job)

[John Jason Jordan]

I need to create a simple graphic, text only, for a banner at a trade
booth. Naturally, people waited until the last minute before asking
me to do this, so I am in a rush. I am trying to set the color of the
text, but in the Properties palette I am offered only a handful of
colors. The output must be CMYK, but I figured I would let the PDF
export handle that. How can I create a custom color for text?