Once installed, you can created a poster in your Wonderland world by selecting "Poster" from the Insert Object dialog. A default poster with the words "Hello World" will appear. Right click on the poster and select "Set Text..." from the context menu. If you want simple text, then replace the words with your custom text.
For more complex posters, you can enter HTML code in the Enter Poster Text window.
This sample HTML poster results in a poster that looks like this:
There are some restrictions on the HTML that you can include. These are detailed in the Java tutorial "How to use HTML in Swing Components."
Archive: v0.1 of the poster module