Scrabbling with Scribus

I'm trying to get to grips with the Free publishing software Scribus, as I want to update the artwork for the OpenDisc DVD. But I have hit what appears to be a brick wall, although I'm sure it's just a learning curve.

The problem I have is being able to apply line-spacing (or leading) to one individual paragraph, not all the paragraphs in a text box (see the illustration for an illustration. This is something you can do in any word processor, so I'm sure I'm just doing something wrong.

Along the path of discovery, what has been cockle-warming and encouraging was the response I had within minutes on the Scribus IRC channel. There is also a Scribus mailing list that you can post to as a guest. I've been set back by the Seasonal Summer Cold and the excruciating necessity to earn a crust in The Smoke, so I'll be revisiting this issue to find a fix.